There appears to be a versions conflict between the Asset (with a later version of Mono/Mono.Cecil.dll and Mono.Cecil.mdb.dll) and Unity - which I think has an older version.
Not sure yet, but we think it may also be effected by which facets you install (ie. IOSBuild, others?) when fresh installing thew latest betas of Unity.
Anyway, here is the error message.
error CS1705: Assembly Mono.Cecil.Mdb, Version=7.7.7.7, Culture=neutral, PublicKeyToken=0738eb9f132ed756' depends on
Mono.Cecil, Version=7.7.7.7, Culture=neutral, PublicKeyToken=0738eb9f132ed756’ which has a higher version number than referenced assembly `Mono.Cecil, Version=0.9.6.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756’
D:\Unity\AllSave Tester\Assets/Autelia/AllSave Pro/Dependencies/Plugins/Cecil/Mono.Cecil.Mdb.dll (Location of the symbol related to previous error)
Compilation failed: 1 error(s), 0 warnings