MySQL - atempt to index local?

[Rat32]

Hello. I have a problem with this error?

CODE:

function logujemy(yonsz, usernamel, passwordl) 
yonsz = exports.DB2:pobierzWyniki("SELECT * FROM ACCS WHERE acc=? AND password=?", usernamel, passwordl) 
if yonsz.acc and yonsz.password then 
outputChatBox("LOG!") 
else 
outputChatBox("UNLOG") 
end 
end 
addEventHandler("doLogin", getRootElement(), logujemy) 

What's the problem?

[Tomas]

  
exports.DB2:pobierzWyniki("SELECT * FROM ACCS WHERE acc=? AND password=?", usernamel, passwordl) 
  

This is returning nil.

[Rat32]

I know, but why?

[Tomas]

I know, but why?

Well, we haven't access to the resource, how could we know it?