c# - An unhandled exception of type 'System.TypeInitializationException' occurred in ConsoleApplication.exe - Automapper -

after taking @ automapper attributes have tried answer this question have made quick console application reproduce behavior. have added (copy-pasted) classes in first example github documentation:

[mapsto(typeof(customer))] public class person {     public string firstname { get; set; }     public string lastname { get; set; }     public string notes { get; set; } }  public class customer {     public string firstname { get; set; }     public string lastname { get; set; }     public string mycustomernotes { get; set; } } 

and added same statements in main:

typeof(program).assembly.maptypes(); //this throws exception var person = new person { firstname = "john", lastname = "lackey" }; var customer = automapper.mapper.map<customer>(person); 

but @ first line of code in main, when calling maptypes method, exception of type typeinitializationexception thrown:

an unhandled exception of type 'system.typeinitializationexception' occurred in consoleapplication.exe

additional information: type initializer 'automapper.attributes.extensions' threw exception.

why exception thrown, since have followed instructions in documentation?

the inner exception is:

{"sequence contains no matching element"}

note:

i using automapper version 5.1.1 , automapper.attributes version 1.0.20.

looks using automapper 5, automapper.attributes seems work version 4. tried version 4 , worked expected.

the problem seems method signature changed, looked via reflection in attributes.extensions