Smart fortwo , the 3 bars Error !!

The smart gearbox relies on a lot of electronics to keep it working properly, it only takes one part to misbehave to call up an error code. Causes can be one or more of the following:
•Faulty SE Drive
•Stuck gears
•Weak battery
•Faulty gear motor
•Faulty gear position sensor
•Faulty clutch actuator
•Chaffed wires

in my case faulty clutch actuator, she is scheduled to the mechanic on Monday