Return
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Title
Error message: Could not load type 'System.Runtime.CompilerServices.IAsyncStateMachine' from assembly 'mscorlib, Version=4.0.0.0, Culture=neutral -
Description
Handling notification: 13 (0000000D)Parameter info1: UnknownParameter info2: nullMessage:Could not load type 'System.Runtime.CompilerServices.IAsyncStateMachine' from assembly 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.Source:00610D62 (Spotlight.0020FD62) 12.3.0.9776Call stack:00610D62 (Spotlight.0020FD62) 12.3.0.97760040CD16 (Spotlight.0000BD16) 12.3.0.977600610D62 (Spotlight.0020FD62) 12.3.0.977600611090 (Spotlight.00210090) 12.3.0.977600D7D752 (Spotlight.0097C752) 12.3.0.977600D7CF27 (Spotlight.0097BF27) 12.3.0.9776008DF056 (Spotlight.004DE056) 12.3.0.9776008DF2B5 (Spotlight.004DE2B5) 12.3.0.977600D8BA9C (Spotlight.0098AA9C) 12.3.0.97760109EA53 (Spotlight.00C9DA53) 12.3.0.97760109F2FA (Spotlight.00C9E2FA) 12.3.0.9776010A7719 (Spotlight.00CA6719) 12.3.0.9776005A70D0 (Spotlight.001A60D0) 12.3.0.9776005ABA30 (Spotlight.001AAA30) 12.3.0.9776005757CE (Spotlight.001747CE) 12.3.0.977600F9D890 (Spotlight.00B9C890) 12.3.0.9776006D8472 (Spotlight.002D7472) 12.3.0.977600462A06 (Spotlight.00061A06) 12.3.0.9776770362FA (USER32.000152FA) 6.1.7601.1751477036D3A (USER32.00015D3A) 6.1.7601.17514770377C4 (USER32.000167C4) 6.1.7601.175147703788A (USER32.0001688A) 6.1.7601.175140057E9C0 (Spotlight.0017D9C0) 12.3.0.9776 -
Resolution
Install new .Net framework at least 4.5 or higher.
For example: https://www.microsoft.com/net/download/thank-you/net462
This error can be reproduced with .Net 4.0 installed.