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I've been using MyDAC 5.7x for a while (registered Professional version) and recently upgraded to 5.90.0.54 (registered Professional version as well).

I use this in combination with FastReport 4.7.

I did compile and install the Thirdparty components found in the win32 demos of MyDAC according to the readme.txt instructions.

I added the path "C:\Program Files\Devart\MyDac for RAD Studio 2007\Demos\Win32\ThirdParty\FastReport\FR4" to the library path.

This used to work just fine with MyDAC 5.7x and FR4.7, but with MyDAC 5.90.0.54 I keep getting the persistent message

"Class TfrxMYDACQuery not found"

I then even added "C:\Program Files\Devart\MyDac for RAD Studio 2007\Demos\Win32\ThirdParty\FastReport\FR4\Delphi11" to the Library path. Still the same message ...

I even tried adding these paths to the browsing path, etc.
No change.

After that I uninstalled all frxMYDAC components and tried installing the old code (that came with MyDAC 5.70) - still same problem.

Any help would be greatly appreciated

As suggested elsewhere on the forum;

I did uninstall MyDAC 5.90 and the FR4 components for MyDAC (so I did not unistall FastReports, just the 3rd party tools offered by Devart).
Restart Delphi. Close Delphi.
Reinstall MyDAC 5.90 and the FR4 components for MyDAC.

Right after the install it works.

Close Delphi and Restart Delphi; and there is the error message again ...

I'm probably overlooking something very simple and basic, but I just can't find what the problem might be


Note: in another article on this forum I also found the suggestion to remove old BPL files. This however is a completely fresh installed Windows, with Delphi 2007, FastReport 4 and MyDAC 5.90 ... nothing else has been installed on this machine.

To solve this problem, open Delphi and check if the "TfrxMYDACComponents" package is checked in Design packages in the Component->Install Packages... menu.