Add-on Corruption "Error : Object reference not set to an instance of an object"

Hi All,

I have created an Add-on in SAP Business One and its working Properly but in some period of time if i connect the add-on i get the following error,

"Object reference not set to an instance of an object".

I tried uninstalling the add-on and installed it again, but also the same error occurs.

I am sometimes create a new ard and solve this problem but now if i try to do that also i did not get the solution.

How to Solve this issue Permanently???

Help me solving this issue.

Regards,

Jananisuba S