I have the same issue with recent SDK.
I tried to enable logging but it gave me no additional info.
The problem stems from error login (in my case due to an invalid application key)
at 181 YahooLogger calls itself causing an infinite loop
YahooLogger::error("ERROR OBJECT - " . print_r($object, true));
replace YahooLogger::setDebugDestination('LOG'); by YahooLogger::setDebugDestination('CONSOLE'); and you get the error message
Hope this helps
Alain