
Hi @Harish,
Firstly check the version of SharePoint designer 2013 on your server via File >> Account >> About SharePoint Designer and please share the version number here.
Then download the latest update for SharePoint Designer 2013(Prerequisite to apply this update, you must have Microsoft SharePoint Designer 2013 Service Pack 1 installed.):
- Download update KB3114721 for 32-bit version of SharePoint Designer 2013
- Download update KB3114721 for 64-bit version of SharePoint Designer 2013
If the issue persists, have a try to clear SharePoint designer 2013 cache. See the steps in this article: How to Clear Your SharePoint Designer 2010/2013 Cache.
Also try to uninstall and reinstall SharePoint designer 2013 if the above steps don't fix this issue.
Please let me know the result after trying the above troubleshooting steps.
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