Plugin not getting updated in managed solution

Hello All,

      I have updated the plugin via Plugin Registration Tool in the sandbox environment. Later I have downloaded the managed solution & created a package to be deployed on Microsoft. While package certification by Microsoft I am always getting the same error. The error which is mentioned for the code in the plugin is fully commented out.  

Please let me know where I missing out the steps in plugin update.

Thanks in advance.

Regards

Siddharth