Sequence initiation requires image size

I am a newbe. I am trying to image a specified target using a nikkn d7000 with a 50mm lens on ioptron 45 eq mount.
I want the sequence to begin and end at specified time. But when i try to run the sequence I get this message
the sequence requires the use of a plate solver but your image scale is set to o please provide a valid scale in the control panel’s camera tab
Cannot figure out where to fix this

Nevermind. Finally got it to work. Had to shut down comouter and restart it.
Now i am fighting with SGP connecting to my mount. It detects it but says it cannot slew… grrrr