mono develop error

i have never used mono before and loaded it up to try and get used to it but i keep getting the same error and i havent got a clue where to look…

whenever i hit (
an error comes up saying

Error in text editor extension chain.

details

System.NullReferenceException: Object reference not set to an instance of an object
at Boo.MonoDevelop.Util.Completion.BooCompletionTextEditorExtension.GetToken (DocumentLocation location) [0x00000] in :0

at Boo.MonoDevelop.Util.Completion.BooCompletionTextEditorExtension.GetToken (MonoDevelop.Ide.CodeCompletion.CodeCompletionContext context) [0x00000] in :0

at Boo.MonoDevelop.Util.Completion.BooCompletionTextEditorExtension.HandleParameterCompletion (MonoDevelop.Ide.CodeCompletion.CodeCompletionContext context, Char completionChar) [0x00000] in :0

at MonoDevelop.Ide.Gui.Content.CompletionTextEditorExtension.KeyPress (Key key, Char keyChar, ModifierType modifier) [0x001b6] in /BuildAgent/work/976433a72acbefb1/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui.Content/CompletionTextEditorExtension.cs:149

at MonoDevelop.SourceEditor.ExtensibleTextEditor.ExtensionKeyPress (Key key, UInt32 ch, ModifierType state) [0x00000] in /BuildAgent/work/976433a72acbefb1/monodevelop/main/src/addins/MonoDevelop.SourceEditor2/MonoDevelop.SourceEditor/ExtensibleTextEditor.cs:257

if you have any 3d models or anything that you have imported right before this happened, delete them, sometimes Unity screws up on demo scripts.