That's usually a sign of a corrupted installation. Reinstalling may fix that.

An error message like XPCOM missing or about platform version or entry points not found can happen because of a failed Thunderbird update that left you with a mixture of old and updated files in the Thunderbird installation folder. This can happen in case security software was keeping a handle of some of the files in the Thunderbird program folder preventing Thunderbird from replacing all the files.

You need to reinstall Thunderbird and possibly remove the Thunderbird program folder to ensure that all files are replaced. You may have to disable security software temporarily in case the problem persists.

This can occur with desktop Firefox also.

By the way you only need to post your thread once as this is a community support forum and not some form of direct chat or ticket system. So replies can take anywhere from minutes to hours or longer.

Your thread on this topic in case you go by automated email https://support.mozilla.org/en-US/questions/1472783