Can't ReAmp in Eleven Rack (output inactive)

I finally decided to try the basic re amping on Eleven Rack using only the eleven rack, no microphones, and I got stuck with this problem: (Image)

For some reason I can´t make the output on the clean signal track to be active. It is displayed in dark grey and when I try to activate it the following message appears "The output could not be made active because its mapped output is currently inactive".

I have gone through the manual and through several videos and instructions online and non of them seem to contemplate this.

Thanks in advance for your help,

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