Error with SSM

When running [this exampe](https://github.com/fourMs/MGT-python/wiki/4-%E2%80%90-Video%E2%80%90based-Processes#ssm) I get the error: `TypeError: 'MgFigure' object is not callable`: 

![image](https://user-images.githubusercontent.com/114316/213281900-86d89eb2-4ad5-4f46-b515-c0924da04fd8.png)

What is wrong?