Sometimes it is easy to get lost in a myriad of log files and Google searches when troubleshooting an issue. However, while searching for a knowledge base article to do with composer error codes, I came across this little gem of a post.
It is a great article that shows the trending problems and associated articles for versions of Horizon View for 4.6 and above.
This is certainly one of those links that will go in the “toolbox” for future.
Hope you find it useful too.