Internet explorer error - incorrect JSON status mapping for 'no such window'

[Russ_Thomas]

We’re going to need to see your test steps (from Script View) and the full error message.

Read this and follow the advice:

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My test is BROKEN! NOTHING WORKS! HELP ME! Relax. We get it. We really do. There are some pretty smart and clever people on this forum, but you must realize, they are not magicians or wizards or gods. They cannot see your code, they can’t see your errors and they don’t even know what your AUT is meant to do even though it might seem perfectly obvious to you. So please relax and follow the advice below, before you start writing your post. The advice below will tell you the exact information …

As a wild guess…

Versions of IE can be overly pedantic about JSON syntax. Watch out especially for trailing commas:

{
  "thing": "value",
  "other-thing": "other value",
}

That last comma is unnecessary but legal - older IEs may not allow it.