I have a test Joomla 4 website that I've installed GPS tools but I get an error opening an article when the plugins are enabled. The error is: 

An error has occurred.   500 behavior::modal not found.

I've tried using the text option e.g. {GPSCONTENT ["id": 1, "elevation": 1, "speed": 1, "hr": 1, "description": 1]} but that doesn't work either as it just displays the text not the GPS file.

Using Joomla 4.0.5 and GPS Tools 5.2.5 with cjlib 3.2.6

I've been using GPS Tools successfully with Joomla 3 for several years.