Lets see what else you might do to troubleshoot the problem.
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How Do I Fix Outlook Data File Errors?
Go toFile, click onOptions, selectUpdate Options, and hit theUpdate Nowbutton.
Press the Windows and R keys to open a new Run window and typeOutlook /safe.
Press Enter and verify if the error persists.
Some users managed to fix this problem by deleting theInternet Calendar subscription.pstfile.
Additionally, create a new Outlook profile, and add your email account to the new profile.
Go toFileAccount SettingsManage ProfilesShow ProfilesAdd name and save the new profile.
Then attach the PST file to the new profile.
peek if this solution did the trick for you.