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Hello @hatimsetti,
According to the error the issue is caused by the MIME type header, which seems to be incorrectly modified. We were unable to replicate the issue on our test environments. Our plugin does not change that header so the issue could be caused by different plugin, theme or specific server configuration. You can deactivate the plugins, switch themes and test again. If the application is hosted on SiteGround servers, you can open a new ticket on our end so we can perform further investigation.
Best Regards,
Dimitar Petrov