Are you seeing that error when editing any of the site's Html modules or just on one particular Html module? If it is happening only on a single module, there is likely a data integrity error that would most easily be corrected by copying its Html contents to the windows clipboard, deleting the Html modue then adding a new instance of the Html module to the page and pasting the contents of the previous module into the new module's editor.

If it happening when editing any Html module, there would appear to be more serious issues, probably due to a failed install of the Html module. If that is the case, please advise the version of the Html module currently installed (get from Host --> Extensions screen). It would also be helpful if you could find out the highest version number of the Html modules SqlDataProvider scripts (xx.xx.xx.SqlDataProvider)  found in the site's DesktopModules/HTML/Providers/DataProviders/SqlDataProvider folder and the file/product version of the Html module assembly file (DotNetNuke.Modules.Html.dll) located in the site's /bin folder.

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner