@Jerry, A similar issue has been posted just a few days ago…
According post Parameter #1 does not contain array of filenames, the devs are working on it.
Have a look at the following issue at Github:
Improve error from Toolbox\Blueprints\BlueprintForm->doLoad() #2782
Also, someone else has added the same experience as you have to the issue on Github.
If you think your have more relevant info to share, please add it to the issue on Github.
Maybe you could close this issue and continue on the previous post on this forum or Github.