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Welcome to the OpenCASA mailing group. All members are welcome to collaborate.
Please take into account the following points and read careful the WELL-KNOWN PROBLEM section by the end of this text:
- Consider that this is an international group. Messages should be written in English.
- Any new comment or issue should start a new thread, with an explanatory subject. Please do not reply to an unrelated thread.
- If you are writing about any problem or bug, please follow the next points:
   - Carefully revise the published threads and confirm that your issue has not been mentioned and solved previously (please read below WELL KNOWN PROBLEM).
   - Describe the problem/issue it with all possible detail. Provide information on your configuration:
      - Operative system, processor and memory.
      - ImageJ or Fiji version.
      - OpenCASA version.
      - Any error messages with full detail.
      - Microscope model, type of optics (describe the objective and intermediate magnification --ocular is irrelevant), camera model, acquisition software (brand, name, and version).
      - Video size, frame rate, scale (microns/pixel). A complete description of your settings, if possible (especially, min/max area, min. track length, and max. displacement).
      - You can share a representative video, but try to keep it of minimal length to reproduce your problem (you might use an external storage system and just share a link).
- Behave kindly and be patient.

WELL-KNOWN PROBLEM:
OpenCASA v. 2 does not work if directly installed on recent versions of ImageJ/Fiji. This is the "NA error." If you try analyzing, you only get NA in the results window.
You need to go to https://wsr.imagej.net/distros/, go to the folder for your system, and download an older version (1.53k from 2021 should work). Just unzip 1.53k, run it, install OpenCASA (do not forget javaml-0.1.7.jar), and run it. Close it and go back to your modern version (maybe it is a good idea to reinstall the plugin).
You might want to check if Java is up to date on your computer. If it's not working, try switching between zips, including Java or "nojre" (no Java).
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