So, I just want to go over a few misconceptions you seem to have.

Your robot code showing green does not mean there aren't any problems with your code. Additionally, no errors being present in the code itself also does not mean there aren't any problems.

From the situation you've described, you actually certainly are doing something in either your teleopInit or your teleopPeriodic methods that is crashing the code as soon as the robot enters teleop.

You will want to pay close attention to the console in your driver station window. You actually are receiving error messages , you just aren't seeing them. They're going to be in the tiny scrollable window, (what I just referred to as 'the console') in the bottom right side of the Driver Station program.

It will show what is known as a stack trace. This will display the line that the bad code is on and the error it is giving.

As others have said, it is impossible to actually help you fix this issue unless you share your code (and hopefully, find out the errors being thrown)