SAAB 340A config warning

[SYSCD7000]

I am finding it very difficult to take this plane off from a runway because I keep getting the CONFIG red warning in the Crew Alert Window.

 

I have ggoogle the problem and learnt that:- 

 

I already have flaps set to 15 ready for takeoff

The trim must be in the green band set on both sides.   This has always been the case.  The MAIN and STBY sides both have arrows pointing to the middle of the green band.

The condition lever as before set to Maximum inside the detent.

 

Please tell me what else  I need to do?

 

 

 

[RainerBerlin]

Maybe you forgot to switch the mode before the takeoff?