Error compiling WebTerminal XML - Router

[blablahole]

I'm using admin access given by my organization and had been trying to install WebTerminal. This error message came out:

To confirm the error I opened to localhost management portal:

And login with the same admin access, then this error showed up:

Keen to get some guidance thanks!

[nikitaeverywhere]

Hello! Thanks for the issue.

Did you try compiling it for the 2nd time?

If the error persists, it looks like the error is within %CSP.REST class. Double check that you have original intersystems class version

[blablahole]

Tried again but the error persists.
I installed IRIS Studio (2021.2.0.650.0-win.msi) provided by my governmental organisation, assuming it's the original version but I could be wrong.

[nikitaeverywhere]

This case is somehow unique. Let's keep it open and see if anyone else is having this problem.

By any chance if you figure out why %CSP.REST class is lacking that method – let us know.