Chevrolet Express Transmission Gear Selector

I Was Driving, Then I Notice The Gear Shift Light Is Off. I Drove To The House And Parked The Vehicle. After Some Minutes I Tried To Start...

Drove Van Parked An Hour Later Tried To Move Van And Shifter Phisically Will Not Go Past Reverse.

After Starting Auto Gear Shift Selector Moved But Selector Lights Did Not Move Nor Did Auto Go In To Gear. What Should I Do First To...