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Sorry that you're not able to open your documents as Photoshop gives you an error "could not open the file as it is not a valid Photoshop document".
Which version of Photoshop are you using and what is your operating system? Are you getting this error while opening all the PSD files?
Would you mind checking out the troubleshooting steps mentioned in this article https://helpx.adobe.com/photoshop/kb/file-recovery-photoshop.html and let us know if that helps?