Ubuntu error found when loading on line 73 when logging in to screen

am facing a problem with lunching into ubuntu , before the problem accurs i tried download bspwm windows manager from the terminal, it was all good until i decided to reboot. the bspwm option wasnt (there in the setting kinda logo) and when i lunched into ubuntu i was given this error . Am kinda beginner so am really worried about lossing any data.

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