Hi makar02, I too faced this issue after updating to r397.
I am using custom index.html file. Every time I export the project, I replace default "index.html" with custom file.
I observed that "<script src="scripts/modernjscheck.js"></script>" is included in default "index.html" file exported using r397.
This line was missing in custom html file.
Adding this line fixed the issue for me.
Hope it helps you.
Member since 9 Jan, 2022