Assembly-CSharp-firstpass.dll.mdb is denied.

Hi.
I recently imported a 2D tile editor from t he asset store into my unity project. After doing so however, I have been unable to access it from the window dropdown menu and I have been receiving the internal compiler editor: “Assembly-CSharp-firstpass.dll.mdb is denied.”
Upon going into the Temp folder to have a looksie, I noticed that although there was a file called “Assembly-CSharp-firstpass.dll” there was no “Assembly-CSharp-firstpass.dll.mdb”.
I’ve tried a the usual set of solutions to solve this kind of compiler error, being turning off firewalls and anti-virus real time scanning, but to no avail.
Any help would be greatly appreciated.

Thank you.

For more details on the error, here is the full output:

Internal compiler error. See the console log for more information. output was:
Unhandled Exception: System.UnauthorizedAccessException: Access to the path “E:\Projects\Stuff\Mycelium\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 :0

at System.IO.FileStream…ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, Boolean isAsync, Boolean anonymous) [0x00000] in :0

at System.IO.FileStream…ctor (System.String path, FileMode mode, FileAccess access) [0x00000] in :0

at Mono.CompilerServices.SymbolWriter.MonoSymbolWriter.WriteSymbolFile (Guid guid) [0x00000] in :0

at Mono.CSharp.SymbolWriter+SymbolWriterImpl.WriteSymbolFile () [0x00000] in :0

at Mono.CSharp.SymbolWriter.WriteSymbolFile () [0x00000] in :0

at Mono.CSharp.CodeGen.Save (System.String name, Boolean saveDebugInfo, Mono.CSharp.Report Report) [0x00000] in :0

at Mono.CSharp.Driver.Compile () [0x00000] in :0

at Mono.CSharp.Driver.Main (System.String[ ] args) [0x00000] in :0

Maybe your antivirus is blocking it?

I appreciate the feedback.
However, as I stated, I have already attempted disabling my anti-virus and firewalls. Unfortunately it did not work this time.