I have also attached a copy of the log error I got from the path provided.
Should I just uninstall KNIME and install it again? If I uninstall, will I still be able to open copies of my saved workflow? Hope somebody can help me with this error.
yes, re-installing a most recent version of AP (the latest one is 5.4.3 as of now) most probably will help you. You will still have access to your workflows since they are saved on your workspace area independently of the application folder. See documentation reference: KNIME Analytics Platform User Guide