Error Log report

5/11/2559 16:45:21: DEBUG - Checking if the PSO2 Tweaker is running
5/11/2559 16:45:21: DEBUG - Program started! - Logging enabled!
5/11/2559 16:45:21: DEBUG - Attempting to auto-load pso2_bin directory from settings
5/11/2559 16:45:21: DEBUG - Loaded pso2_bin directory from settings
5/11/2559 16:45:21: DEBUG - Pursuing freedom...
5/11/2559 16:45:22: DEBUG - Loading settings...
5/11/2559 16:45:22: DEBUG - Load more settings...
5/11/2559 16:45:22: DEBUG -

5/11/2559 16:45:22: DEBUG - ----------------------------------------
5/11/2559 16:45:22: DEBUG - Program opening, running diagnostics...
5/11/2559 16:45:22: DEBUG - Current OS Full name: Microsoft Windows 7 Ultimate
5/11/2559 16:45:22: DEBUG - Current OS Version: 6.1.7601.65536
5/11/2559 16:45:22: DEBUG - Is the current OS 64-bit? False
5/11/2559 16:45:22: DEBUG - Directory program is running in: D:\
5/11/2559 16:45:22: DEBUG - Selected PSO2 Directory: D:\SEGA\PHANTASYSTARONLINE2\pso2_bin
5/11/2559 16:45:22: DEBUG - Run as Administrator: True
5/11/2559 16:45:22: DEBUG - Is 7zip available: False
5/11/2559 16:45:22: DEBUG - Is Unrar Available: False
5/11/2559 16:45:22: DEBUG - ----------------------------------------
5/11/2559 16:45:23: DEBUG - Loading color stuff...
5/11/2559 16:45:23: ERROR -  - System.TypeLoadException: System.TypeLoadException: Could not load type 'System.Runtime.CompilerServices.IAsyncStateMachine' from assembly 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
   at PSO2_Tweaker.FrmMain.
(Object , EventArgs )
   at System.EventHandler.Invoke(Object sender, EventArgs e)
   at System.Windows.Forms.Form.OnLoad(EventArgs e)
   at DevComponents.DotNetBar.Office2007RibbonForm.OnLoad(EventArgs e)
   at System.Windows.Forms.Form.OnCreateControl()
   at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
   at System.Windows.Forms.Control.CreateControl()
   at System.Windows.Forms.Control.WmShowWindow(Message