I have version 2.1.2 The projects that won't open (two of them now) were created using this version and I've never had another version installed on this computer. This is why I"m confused by the error message. I've successfully opened, saved and closed the projects several times. However, prior to receiving this error message each project crashed during the exporting of data to a feature class. Both of these instances occurred in the last two days. I can still access layers from their respective geodatabases, however.
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