Internal Server Error after updating via git pull

My last git pull for my website caused an internal server error. I did not encounter the problem when running it on my localhost on Mac. I noticed however that during the first attempt of the git pull that there is a request to commit the requirements.txt. Instead, I deleted the file on the server and my git pull did not raise any issue (the requirements.txt is available in the git pulled). This may be the one causing the problem or it may not. I have no idea how to check or resolved the issue. I have powered off and on. I have pip install - r requirements.txt. Restart nginx and gunicorn. None seems to have worked. I cant even find the error.log file in the droplet. Can anyone assist me. The website is www.faseries.com