Compiler Error CS1548
CS1548 occurs when assembly signing fails. This is usually due to an invalid key file name, an invalid key file path, or a corrupt key file.
To fully sign an assembly, you must provide a valid key file that contains information about the public and private keys. To delay sign an assembly, you must select the Delay sign only check box and provide a valid key file that contains information about the public key information. The private key is not necessary when an assembly is delay-signed.
When creating an assembly, the C# compiler calls into a utility called al.exe. If there is a failure in the assembly creation, the reason for the failure is reported by al.exe. See Al.exe Tool Errors and Warnings and search that topic for the text reported by the compiler in 'reason'.