Internal compiler error.

 Internal compiler error. See the console log for more information. output was:
 Unhandled Exception: System.UnauthorizedAccessException: Access to the path "C:\Users\Public\Documents\Unity Projects\Database\Temp\Assembly-CSharp-firstpass.dll.mdb" is denied.
 
   at System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, Boolean anonymous, FileOptions options) [0x00000] in <filename unknown>:0 
 
   at System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, Boolean isAsync, Boolean anonymous) [0x00000] in <filename unknown>:0 
 
   at System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access) [0x00000] in <filename unknown>:0 
 
   at Mono.CompilerServices.SymbolWriter.MonoSymbolWriter.WriteSymbolFile (Guid guid) [0x00000] in <filename unknown>:0 
 
   at Mono.CSharp.SymbolWriter+SymbolWriterImpl.WriteSymbolFile () [0x00000] in <filename unknown>:0 
 
   at Mono.CSharp.SymbolWriter.WriteSymbolFile () [0x00000] in <filename unknown>:0 
 
   at Mono.CSharp.CodeGen.Save (System.String name, Boolean saveDebugInfo, Mono.CSharp.Report Report) [0x00000] in <filename unknown>:0 
 
   at Mono.CSharp.Driver.Compile () [0x00000] in <filename unknown>:0 
 
   at Mono.CSharp.Driver.Main (System.String[] args) [0x00000] in <filename unknown>:0 

I get this error every time I try to build a project, has anyone encountered this before? If so please post your fixes. Thanks.

EDIT: While this error is in my console unity wont recompile any of my scripts. :/