Here's the list of the most annoying error codes (and the solutions to these errors):
Error 24
Error 101
Error 110
Error 120
Error 403
Error 413
Error 481
Error 489
Error 491
Error 492
Error 495
Error 497
Error 498
Error 504
Error 505
Error 911
Error 914
Error 919
Error 920
Error 921
Error 923
Error 927
Error 941
Error 961
Error "download unssuccesful"
Error "installation unssuccesful"
Error "no connection"
Error "package file invalid"
Error "rh01"
Error "rpc:aec:0]"
RPC:S-3 error retrieving information from server
Error "rpc:s-5:aec-0"
RPC: S-7 error retrieving information from server
There're several solutions on how to fix these errors inside the app.