I got this error

[kangjie321]

when i run env.render
i get this error
AssertionError: No 'v' attribute found in ShaderProgram(id=4).
Valid attibutes are: {'colors': Attribute('colors', program=4, location=1, count=4, format=f), 'position': Attribute('position', program=4, location=0, count=3, format=f), 'tex_coords': Attribute('tex_coords', program=4, location=2, count=3, format=f)}.

[semitable]

Hi,
Can you post the full stack trace (i.e. the line this error is thrown)?
To be honest, this doesn't look to originate from our code base, so I am thinking this is a mix-up/incompatibility with an installed package (e.g. pyglet or gym?)
Could you also post information about the system you are running and the installed packages (versions)?