The 'midi==0.2.3' distribution was not found and is required by the application

[johnguacala]

When I try to read a mididump.py mary.midi shows this error

Traceback (most recent call last): File "C:\ProgramData\Anaconda3\envs\tweetproject\Scripts\mididump.py", line 4, in import('pkg_resources').run_script('midi==0.2.3', 'mididump.py') File "C:\Python27\lib\site-packages\pkg_resources_init_.py", line 3126, in @call_aside File "C:\Python27\lib\site-packages\pkg_resources_init.py", line 3110, in call_aside f(*args, **kwargs) File "C:\Python27\lib\site-packages\pkg_resources_init.py", line 3139, in initialize_master_working_set working_set = WorkingSet.build_master() File "C:\Python27\lib\site-packages\pkg_resources_init.py", line 581, in build_master ws.require(requires) File "C:\Python27\lib\site-packages\pkg_resources_init.py", line 898, in require needed = self.resolve(parse_requirements(requirements)) File "C:\Python27\lib\site-packages\pkg_resources_init.py", line 784, in resolve raise DistributionNotFound(req, requirers) pkg_resources.DistributionNotFound: The 'midi==0.2.3' distribution was not found and is required by the application

anyone knowa what does it means?