Problem after restoring an Open Atrium Website - Unsupported operand types in entityreference.module

Hi,

My Open Atrium website suddenly stopped working so I restored the last backup of the Website that I have. I was able to restore my database properly and also be able to replace "sites" folder at main website folder.

But when I try to execute the OPEN ATRIUM website again then it is still showing the blank page. I review the log file at web server and found that the following message is showing at that log-file.

Error:
entityreference_get_behavior_handlers
[Mon May 11 15:04:22 2015] [error] [client 10.63.40.111] PHP Fatal error: Unsupported operand types in
profiles/openatrium/modules/contrib/entityreference/entityreference.module on line 143

I am also attaching entityreference.module file for your review. If you need any additional information to resolve that issue then please feel free to let me know.

An early response in that regard would be highly appreciated as currently my website is offline.

Tauseef....