Hi @asprakash83,
I hope you're doing well. This happens because it seems there is a newer version of the file available, you can see on the top left that you have the warning yellow triangle. You can do a File > Save As Latest to make it the latest version of the file. I figure that's what you are trying to do.
Let me know if there's anything else I can do for you.
Best Regards,

Jorge Garcia
Product Support Specialist for Fusion 360 and EAGLE
Kudos are much appreciated if the information I have shared is helpful to you and/or others.
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