410 Error swift-performance.appcache

I am getting a 410 error for the link https://radiogyan.com/swift-performance.appcache.

I am not sure where is this loading from. Here is the test result: https://www.dotcom-tools.com/website-speed-test.aspx#C54D9A03A6504A13B55FAFAC211F9A12

All the reds from multiple locations are due to 410 error in this file link. I tried to search for app cache but I could not find it. I am using the free version.

Thank you.

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