TypeError: ('Bad header in MIDI file.', b'')

[ExodusSolis]

Ran this on Google Colab, I uploaded a midi file and tested multiple and kept getting this error. What's going on?
(Also, IDK why the indentations arent working on the code)
`
#MIDI TO CSV

import py_midicsv as pm
def midi2csv():
save=input('filename\n')
print("Step 1")
owo=open(save,mode='w')
print("Step 2")
owo.write(str(pm.midi_to_csv(str(save)+'.mid')))
print("Step 3")
owo.close
print("Step 4")
messagebox.showinfo('Complete','file saved as {}'.format(save))
print("Step 5")
while 1==1:
x=input('midi to CSV: 0\nend: 2\n')
if x == '0':
midi2csv()
elif x == '2':
break
`

[ExodusSolis]

Just user error