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TINA-TI: Putting a Current Arrow gives me "Irregular Circuit"

Part Number: TINA-TI

Hello everyone.

I need to do a semi symbolic analysis of my (linear 2nd order) circuits in Tina. 

This official tutorial (https://youtu.be/5W4oD9qrbvc?t=229) shows how to use the voltage pin and get the forula that describe the mesured voltage in the time domain.

Anyway I want to analyse the currents that flow in my circuit too.

For doing that I'm using a current arrow or an amper meter, but I get an "Irregular circuit" error. https://imgur.com/a/qUtJNsL

What am I getting wrong?