Errors on compile in Unity 4.6.3

[DavidENishball]

I am attempting to use fullserializer for my unity 4.6.3 project. However, I get the following errors when attempting to build.
http://puu.sh/hpHKW/b277078a90.png

fsEnumConverter.cs(39,52) Type 'StringBuilder' does not contain a definition for 'Append'
fsEnumConverter.cs(41,32) Type 'StringBuilder' does not contain a definition for 'Append'
fsJsonParser.cs(251,85): Type 'StringBuilder' does not contain a constructor that takes '1' argument.

This appears to be due to Unity using an older equivalent version of .Net, one without the extra methods and constructors for StringBuilder class. I am wondering how you managed to work around this problem?

[jacobdufault]

Wow, how strange. Can you please verify that there is not another class in your project called StringBuilder? What .NET profile setting are you on?

[DavidENishball]

Ah, you are right. There was a custom StringBuilder class from an early version of the project. Renaming it fixed the errors. Thank you!