CastSpellById Help

[naa]

Hello, i have been trying to get CastSpellById to work but i keep getting an error: Injection failed for some reason.
Code:

        public bool CastSpellByID(uint id)
        {
            Console.WriteLine("Castspell");
            uint codeCave = wow.AllocateMemory();
            const uint CastSpellID = 0x007735F0;

            wow.Asm.Clear();
            wow.Asm.AddLine("fs mov eax, [0x2C]");
            wow.Asm.AddLine("mov eax, [eax]");
            wow.Asm.AddLine("add eax, 8");
            wow.Asm.AddLine("mov dword [eax], {0}", CurMgr);

            wow.Asm.AddLine("push 0");
            wow.Asm.AddLine("push 0");
            wow.Asm.AddLine("push 0");
            wow.Asm.AddLine("push {0}", id);

            wow.Asm.AddLine("call {0}", CastSpellID);
            wow.Asm.AddLine("add esp,16");
            wow.Asm.AddLine("retn");

            wow.Asm.InjectAndExecute(codeCave); //<-- This line makes the error
            wow.FreeMemory(codeCave);
            return true;
        }

The code that calls the function:

      BlackMagic wow;
      UInt32 g_clientConnection, clientConnection, CurMgr, CurMgrOffset;

      private const string PATTERN_CLIENT_CONNECTION = "EB 02 33 C0 8B D 00 00 00 00 64 8B 15 00 00 00 00 8B 34 8A 8B D 00 00 00 00 89 81 00 00 00 00";
      private const string MASK_CLIENT_CONNECTION = "xxxxxx????xxx????xxxxx????xx????";
     Public go()
     {
            uint dwCodeLoc;
            wow = new BlackMagic();
            if (wow.OpenProcessAndThread(SProcess.GetProcessFromProcessName("wow")))
            {
                dwCodeLoc = SPattern.FindPattern(wow.ProcessHandle, wow.MainModule, PATTERN_CLIENT_CONNECTION, MASK_CLIENT_CONNECTION, ' ');

                g_clientConnection = wow.ReadUInt(dwCodeLoc + 0x16);
                clientConnection = wow.ReadUInt(g_clientConnection); 
                CurMgrOffset = wow.ReadUInt(dwCodeLoc + 0x1C);
                CurMgr = wow.ReadUInt(clientConnection + CurMgrOffset);

                Console.WriteLine("CLIENT_CONNECTION: 0x{0:X08}", clientConnection);
                Console.WriteLine("CURMGR_OFFSET: 0x{0:X08}", CurMgrOffset);
                Console.WriteLine("CurMgr: 0x{0:X08}", CurMgr);
                Console.ReadLine();
                CastSpellByID(2050); //Lesser Heal rank 1
            }
            else
            {
                Console.WriteLine("World of Warcraft could not be opened for read/write.");
            }
    }

I am rather new to ASM and memory programming.

[Robske]

is FASM.dll in your output directory?

[naa]

is FASM.dll in your output directory?

Yes got:
BlackMagic.dll
fasmdll_managed.dll
FASM.DLL

in my output dir.
BlackMagic and fasmdll_manged is set as references and i am "using Magic;"

[naa]

Hmm I tried to move the code to a new project and now it works
I did not change anything so dunno what stopped it from working before.
If anyone needs a CastSpellById the above code works (Copied from around the board so credits to Shynd and others).
But thanks for you help