“Failed to load installed package” error thrown in the Console when opening Apps and Ad Units in Ads Mediation

[LevelPlay]: Failed to load installed package: System.IO.DirectoryNotFoundException: Could not find a part of the path "/Users/user.name/Projects/My project/Assets/LevelPlay/Editor/LevelPlayVersions.json".
  at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.Boolean anonymous, System.IO.FileOptions options) [0x00164] in <346da8cd57274f9fb70f7bb52cee8325>:0 
  at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.IO.FileOptions options) [0x00000] in <346da8cd57274f9fb70f7bb52cee8325>:0 
  at (wrapper remoting-invoke-with-check) System.IO.FileStream..ctor(string,System.IO.FileMode,System.IO.FileAccess,System.IO.FileShare,int,System.IO.FileOptions)
  at System.IO.StreamWriter..ctor (System.String path, System.Boolean append, System.Text.Encoding encoding, System.Int32 bufferSize) [0x00055] in <346da8cd57274f9fb70f7bb52cee8325>:0 
  at System.IO.StreamWriter..ctor (System.String path) [0x00008] in <346da8cd57274f9fb70f7bb52cee8325>:0 
  at (wrapper remoting-invoke-with-check) System.IO.StreamWriter..ctor(string)