Unable to upload images after upgrade to 3.6.3

[fatman00]

Hi,

I have just upgraded my netbox instance to 3.6.3 but have now noticed that I am unable to upload images using the GUI.
If I try to upload a JPG file of 20mbit it gives me an error 413. I can see this is a file to big http error.

If I try something smaller I get the usual Netbox server error page as shown here:

I am not sure how to solve this and any help would be appreciated.