To reproduce:
1. Open users attached project "Unity Bug Report.zip"
2. Build for iOS
3. Observe the console for errors:
"IL2CPP error for type 'System.Array' in assembly '/Users/aurimasaugutis/Downloads/case_1085551-Unity_Bug_Report/Temp/StagingArea/Data/Managed/mscorlib.dll'"

Reproduced on:
2018.3.0b1, 2018.3.0b2, 2018.3.0b7, 2019.1.0a6(TextMeshPro errors)

Not reproduced on:
2018.2.14f1(after deleting Unity/cache/packages folder), 2018.3.0a11

Notes:
On other versions, Package window can't be opened and getting TextMeshPro errors when trying to build
2018.3.0b7 2019.1.0a6
On 2018.2.14f1 getting Packages errors. Deleting Unity/cache/packages folder fixes the errors.