Error Synchronising Gmail calendar

I just upgraded to version 5 and when I opened the program, my calendar did not sync properly. Not all appointments are showing. Below is the message I get!

An error occurred

Creating or updating folder ‘@gmail.com/Username/’. Failed with an error: Object reference not set to an instance of an object.

Hello,
please send us your GData log. Go to menu Tools->Settings->Advanced->Logging and check “GData” under the problematic account. Then restart eM Client,
try to simulate the issue and send us (with reference to this topic) the logs using the same logging settings window. Thank you.