Sage 300 ERP UI Container has stop working

Hello Guys,

Our client is currently experiencing the above Error Message while Converting Quote to Sales Order, you advise will be highly appreciated.

Below are the details of the Client System:

Sage 300 ERP Version: 6.1A, 

Product Update 3

Database Server: SQl Server 2008 R2

OS: Window Server 2008 R2 Standard 

Note: I have read all the log on the Sage Communicate relating to this error message but still not able resolve the error.