RCVis can't open the only JSON file output by RCTab

probably a user error, but this is the Output folder from running RCTab:

Note that RCVis says it imports RCTab JSON files. This was the only one and the instructions provided by RCVis don't explain

Begin by reproducing the import with the only JSON file in the RCTab Output folder and compare it with RCVis's documented RCTab JSON expectations. Inspect the RCTab import entry point and any existing import tests; done means RCVis opens the supplied output or clearly explains which file is required.

Written by the indexing model from the issue text.