Unable to run script using Firefox - get error "Unable to find the object Sys.Browser("*)"

I have a script that runs the following (Python) code to open the browser and pass in a  valid URL:   

Browsers.Item[btFirefox].Run(Project.Variables.EMBEDDED_LINK_URL)

 

It fails on this line each time I run it, giving a "Unable to find the object Sys.Browser("*"). I am able to successfully run this same script if I try btIExplorer or btChrome. 

 

The version of Firefox I have installed is 100.0.2 (64-bit). I had a look at the Firefox patches page and it looks like the latest patch is for Firefox version 98.

The version of TestComplete I have currently is 15.30.355.7 x64. 

 

Any help is appreciated, thanks!

Should I update my version of TestComplete to 15.40? Will this resolve the issue with Firefox?