We have a DMS running DataMiner 10.1.7 and SRM 1.2.15_CU1.
We see a lot of errors with we press validate on SRM_CreateNewBooking automation script, showing compilation errors, most likely due to some missing files that break the compilation of the automation script C# code.
I also checked if that dlls from the package are in DataMiner files (looking to the Modified Dates, all checks-out).
Are we missing any pre-requisite?
It looks like some C# compile errors in general. nothing to do with DM or SRM package.
For C#7.0 you need .NET 4.6.2 and for C#7.3 you need .NET 4.7.2.
I recommend to check the NET version and if needed, to install the latest version of .NET
More info on value tuples: http://blog.monstuff.com/archives/2017/03/valuetuple-availability.html