I got a problem when testing the trader npc:
I included the sample npc to test it and check how it works and i get this:
[Notice]: Conflicting var name 'Red_Potion', prioritising the script var[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: tradertype (1 parameter):[Debug]: Data: variable name='NST_MARKET'[Debug]: Source (NPC): HaiMarket at prontera (150,160)[Warning]: script_get_val: cannot access player variable 'NST_MARKET', defaulting to 0[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: tradertype (1 parameter):[Debug]: Data: variable name='NST_CUSTOM'[Debug]: Source (NPC): TestCustom2 at prontera (153,152)[Warning]: script_get_val: cannot access player variable 'NST_CUSTOM', defaulting to 0[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: tradertype (1 parameter):[Debug]: Data: variable name='NST_CASH'[Debug]: Source (NPC): TestTraderCash at prontera (152,152)[Warning]: script_get_val: cannot access player variable 'NST_CASH', defaulting to 0[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#ve at ve_in (243,303)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#ve at ve_in (243,303)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#tu at tur_dun01 (158,54)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#tu at tur_dun01 (158,54)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#ra at ra_in01 (257,269)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#ra at ra_in01 (257,269)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#prt1 at prt_in (126,76)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#prt1 at prt_in (126,76)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#prt at prt_fild05 (290,221)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#prt at prt_fild05 (290,221)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#pay3 at payon (159,96)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#pay3 at payon (159,96)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#pay2 at payon_in02 (87,34)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#pay2 at payon_in02 (87,34)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#pay at payon_in01 (5,49)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#pay at payon_in01 (5,49)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#mosk at mosk_in (21,254)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#mosk at mosk_in (21,254)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#moc2 at moc_ruins (114,63)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#moc2 at moc_ruins (114,63)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#moc1 at moc_ruins (91,128)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#moc1 at moc_ruins (91,128)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#xmas at xmas_in (40,38)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#xmas at xmas_in (40,38)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#lou at lou_in02 (239,176)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#lou at lou_in02 (239,176)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#lhz2 at lhz_in03 (239,106)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#lhz2 at lhz_in03 (239,106)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#yuno2 at yuno_in01 (25,34)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#yuno2 at yuno_in01 (25,34)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#yuno at yuno (218,97)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#yuno at yuno (218,97)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#hu at hu_in01 (241,368)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#hu at hu_in01 (241,368)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#gon at gonryun (147,84)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#gon at gonryun (147,84)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#gef at geffen_in (77,167)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#gef at geffen_in (77,167)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Paddler#ein at einbroch (82,199)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Paddler#ein at einbroch (82,199)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#ein at ein_in01 (189,15)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#ein at ein_in01 (189,15)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#cmd2 at cmd_fild07 (257,126)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#cmd2 at cmd_fild07 (257,126)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#cmd at cmd_in01 (79,182)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#cmd at cmd_in01 (79,182)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#ayo at ayo_in01 (18,182)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#ayo at ayo_in01 (18,182)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#ama at ama_in01 (24,30)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#ama at ama_in01 (24,30)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#alde at aldeba_in (94,56)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#alde at aldeba_in (94,56)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#alb2 at alberta_in (182,97)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'![Debug]: Source (NPC): Tool Dealer#alb2 at alberta_in (182,97)[Error]: script_rid2sd: fatal error ! player not attached![Debug]: Function: sellitem (1 parameter):[Debug]: Data: variable name='Red_Potion'[Debug]: Source (NPC): Tool Dealer#alb at alb2trea (87,65)[Warning]: script_get_val: cannot access player variable 'Red_Potion', defaulting to 0[Warning]: buildin_sellitem: unknown item id '0'!