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delphidelphi-7tclientdataset

"No value for parameter" error message

I'm new to Delphi7.

When I try to use the editor's "Add all fields" feature on a TClientDataSet object a messagebox (the classic error message box) appear with the message "No value for parameter '(the name of the parameter)'".
I can't add fields using the "all fields" feature anymore.
How can I find the source of the "No value for parameter" error?

Solution

  • I managed by myself. The TClientDataSet object had a parameter with DataType and ParamType properties both set to Unknown. Setting the parameter with correct properties solved the problem, I was able to "add all fields" again. Thanks for the answers.