First problem:
Add-Ons/System_PropSys/PropSys.cs
Second problem:
Add-Ons/Script_AddOnFavorites/client.cs
And be sure to update
Client_Themes as it was known to cause issues with the printer in the past.
Odds are the second problem doesn't exactly matter, however it is a broken and outdated add-on.
You also have a lot of music that's above the legal limit, you should get rid of those or reduce the sizes.