Feedback, Complaints or Problems

Tried to start up the Starbound trainer (released 5/29/2015), got this error

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OS Name: Microsoft Windows 7 Home Premium
OS Platform: 64-Bit

Running as administrator: True
Installed Antivirus: AVG Internet Security 2015
Installed Firewall: AVG Internet Security 2015

Error Output:
System.InvalidOperationException: An error occurred creating the form. See Exception.InnerException for details. The error is: Could not load type 'System.Runtime.CompilerServices.ExtensionAttribute' from assembly 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. ---> System.TypeLoadException: Could not load type 'System.Runtime.CompilerServices.ExtensionAttribute' from assembly 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
at System.ModuleHandle.ResolveMethod(RuntimeModule module, Int32 methodToken, IntPtr* typeInstArgs, Int32 typeInstCount, IntPtr* methodInstArgs, Int32 methodInstCount)
at System.ModuleHandle.ResolveMethodHandleInternalCore(RuntimeModule module, Int32 methodToken, IntPtr[] typeInstantiationContext, Int32 typeInstCount, IntPtr[] methodInstantiationContext, Int32 methodInstCount)
at System.ModuleHandle.ResolveMethodHandleInternal(RuntimeModule module, Int32 methodToken, RuntimeTypeHandle[] typeInstantiationContext, RuntimeTypeHandle[] methodInstantiationContext)
at System.Reflection.CustomAttributeData..ctor(RuntimeModule scope, CustomAttributeRecord caRecord)
at System.Reflection.CustomAttributeData.GetCustomAttributes(RuntimeModule module, Int32 tkTarget)
at System.Reflection.CustomAttributeData.GetCustomAttributesInternal(RuntimeAssembly target)
at System.Reflection.RuntimeAssembly.GetCustomAttributesData()
at System.Reflection.CustomAttributeData.GetCustomAttributes(Assembly target)
at System.Resources.ManifestBasedResourceGroveler.GetNeutralResourcesLanguage(Assembly a, UltimateResourceFallbackLocation& fallbackLocation)
at System.Resources.ResourceManager.CommonSatelliteAssemblyInit()
at System.Resources.ResourceManager..ctor(Type resourceSource)
at System.ComponentModel.ComponentResourceManager..ctor(Type t)
at Starbound_CH.Form1.InitializeComponent()
at Starbound_CH.Form1..ctor()
--- End of inner exception stack trace ---
at Starbound_CH.My.MyProject.MyForms.Create__Instance__[T](T Instance)
at Starbound_CH.My.MyApplication.OnCreateMainForm()
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
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Any tips on what is going on?

[Edited by Froggeh, 6/1/2015 12:31:23 AM]

Reinstall .NET framework 4.5 to fix this issue.