SMG skipping gears

What is your question?

It started yesterday, when all of the sudden my SMG when off gear, the gear number started to blink and the transmission yellow light turned on. After this i turn the engine off and back on and wouldnt go into gear, then with the engine off i put it in gear and it worked, however when i push the car to 4000 rpm or more it doesnt go into the next gear, right now is skipping 3rd gear. Any ideas are welcome Thanks