Close Dreamweaver, rename the Configuration folder to Configuration_backup and restart Dreamweaver.
BTW, I did check to see that the file listed in the above error message was there and it was.
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When DW starts acting weird, the first thing to try is Deleting Corrupted Cache in DW
If that doesn't help, try Restore Preferences
If all else fails, use the CS Cleaner Tools below to wipe all traces of DW from your system, followed by a software re-install.