XXX/RichTextBox.cs(8) error CS0234: The type or namespace name `RichTextBox' could not be found in namespace `System.Windows.Forms'

** (/usr/local//lib/mono/1.0/mcs.exe:23858): WARNING **: Could not load class from token 0x01000086 in /mono/BaseUserInterfaces/DevExpress.XtraGrid.dll

Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object
in <0x11af1d70> (wrapper managed-to-native) System.Reflection.Assembly:InternalGetType (System.Reflection.Module,string,bool,bool)
in <0x00004> (wrapper managed-to-native) System.Reflection.Assembly:InternalGetType (System.Reflection.Module,string,bool,bool)
in <0x00029> System.Reflection.Assembly:GetType (string,bool,bool)
in <0x00014> System.Reflection.Assembly:GetType (string)
in <0x00070> Mono.CSharp.TypeManager:LookupTypeReflection (string)
in <0x00066> Mono.CSharp.TypeManager:LookupTypeDirect (string)
in <0x000e6> Mono.CSharp.DeclSpace:LookupInterfaceOrClass (string,string,bool&)
in <0x00283> Mono.CSharp.DeclSpace:FindType (Mono.CSharp.Location,string)
in <0x00043> Mono.CSharp.SimpleName:ResolveAsTypeStep (Mono.CSharp.EmitContext)
in <0x00029> Mono.CSharp.Expression:ResolveAsTypeTerminal (Mono.CSharp.EmitContext,bool)
in <0x0006f> Mono.CSharp.DeclSpace:ResolveBaseTypeExpr (Mono.CSharp.Expression,bool,Mono.CSharp.Location)
in <0x000bc> Mono.CSharp.TypeContainer:GetNormalBases (Mono.CSharp.TypeExpr&,bool&)
in <0x00084> Mono.CSharp.TypeContainer:GetClassBases (Mono.CSharp.TypeExpr&,bool&)
in <0x0013f> Mono.CSharp.TypeContainer:DefineType ()
in <0x000cc> Mono.CSharp.Class:DefineType ()
in <0x0036a> Mono.CSharp.RootContext:ResolveTree ()
in <0x00ad1> Mono.CSharp.Driver:MainDriver (string[])
in <0x0000f> Mono.CSharp.Driver:Main (string[])