Bench is Broken

Can anyone help me with this error? Every time I want to do a command on bench it an error appears like this. How can this be fixed?

Hi,

Is this happening on a new installation or have you updated before without trouble?

May be your bench is not installed yet.

I tried updating it but after sometime this happened…

Its already installed and its working before. It happened after I tried to update the version of my ERPNext