I am having some problems with SSRS reports a former employee created. The first problem comes when exporting the report results to Excel. They throw an error "We found a problem with some content. Do you want to try to recover?" and then the recovery doesn't quite work. Exporting to other file types, like PDF or Word, works. Secondly, trying to view the reports from inside Visual Studio gives the error "An error occurred during local report processing." No changes have been made to the reports and their respective VS projects have been recovered from data backups. Can I somehow redeploy without using Visual Studio? How do I troubleshoot what is causing the error if nothing has changed? Does using a newer version of Visual Studio somehow break formatting in reports made in earlier versions?
Edit: Even when the query that builds report returns NO DATA, the errors still happen.