Hello GD,
My first guesses would be that you've either accidentally mistyped the name/path of the folder containing the rank's samples slightly (which is very easy to do, even if it looks correct), or that you've specified the wrong installation package ID (or that you're using a Mac and installed macOS with the non-default case-sensitive file system and that the name/path of the folder you specified has the wrong case).
Also, when loading the CODM organ via 'Design tools | Load custom organ ...', to guard against the possibility of the cache being out of date in case you've changed a sample in your CODM ODF since the cache was generated, keep all of the options ticked on the 'Load Organ Design Options' screen *except* for:
- 'Do not save data to sample set data cache ...'.
- 'Skip all organ definition validation ...'.
If those things don't help to find the problem then please copy and paste the full exact text of the line with the error message (and the preceding lines that contain any errors) from the log (Help | View activity log'), so that we can see the specific errors you're getting.