export bank reloaded non funziona

[-stolka-]

the debug reports "attempt to perform arithmethic on a nil value line 4" so i tried to see how getBankAccountBalance returns and output it in the chatbox! it outputs 'false' in chatbox

function enterClubConfirmed(  ) 
 oldBalance = exports [ "bank-reloaded" ]:getBankAccountBalance ( "stolka" ) 
 outputChatBox(tostring(oldBalance)) 
 exports [ "bank-reloaded" ]:setBankAccountBalance ( bankAccount, tonumber( oldBalance ) + 120 ) 
 fadeCamera( player, true, 1.5 ) 
 setElementDimension( player, 2 ) 
 setElementInterior( player, 2 ) 
end 
addEvent( "onPlayerClubConfirm", true ) 
addEventHandler( "onPlayerClubConfirm", getRootElement(), enterClubConfirmed ) 

[Anubhav]

  
function enterClubConfirmed(  ) 
 oldBalance = exports [ "bank-reloaded" ]:getBankAccountBalance ( "stolka" ) 
 if not oldBalance then 
 exports ["bank-reloaded"]:setBankAccountBalance( "stolka", 0) 
 oldBalance = exports [ "bank-reloaded"]:getBankAccountBalance( "stolka" ) 
end 
 outputChatBox(tostring(oldBalance)) 
 exports [ "bank-reloaded" ]:setBankAccountBalance ( bankAccount, tonumber( oldBalance ) + 120 ) 
 fadeCamera( player, true, 1.5 ) 
 setElementDimension( player, 2 ) 
 setElementInterior( player, 2 ) 
end 
addEvent( "onPlayerClubConfirm", true ) 
addEventHandler( "onPlayerClubConfirm", getRootElement(), enterClubConfirmed )