Extruder blocked?

Printed some tpu and now whenm i went to switch back to ams and some petg , ot keeps saying to pull back filament from extruder?

I’m guessing that theres a bloackage? and i have to remove extruder to check and clean it?

thanks in advance for your help?

Yup. Check the filament run out sensor.

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thank you ! going to do it now