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A few people have reported success in getting around this problem with the following steps:
1) Close Dreamweaver
2) Uninstall DataAssist from the extesnion manager.
3) Delete the Dreamweavver Cache File from the Dreamweaver Configuration Folder.
4) Delete the WADataAssist.dll file from JSExtensions folder that is locate in the Dreamweaver Configuration folder.
5) Restart the computer.
6) Reinstall DataAssist.
If you still experience the same error after following these steps, please post back and I will start a support ticket for you.