I am unable to submit, getting graded 0 due to erros!

I have finished my code and have written it but when I have it and submit, I get an error:

There was a problem compiling the code from your notebook, please check that you saved before submitting. Details:
unexpected indent (, line 259)

I have treid checking for an indentation mistake on like 259 but I dont have a line 259!!!
I’m not sure how to continue as I cant get a grade on the assignment.

Hmm, would you perhaps try to reset the notebook “Get Latest Version” option, but save your current one with the solutions under a different name. Then, in the reset notebook, copy and paste your solution, but make sure you are not changing any of the cells you are not supposed to.

Also run all the cells before submitting it! Let us know!