Monodevelop not showing autocomplete / intellisense in Mac OS 10.6.7

UPDATE Oct 28 2011

So, I have updated Unity to the newest minor version and this problem has returned. The CodeCompletionData folder listed below, while correctly referencing all the UnityEngine and UnityEditor classes for intellisense / autocomplete, I am once again missing all the basic "System" files from native C#.


 using System.Collections;
 using System.Collections.Generic;

 // .....

 private List<Foo> someFoo; // List will not autocomplete and no data is available

 // .....

 Sys // <- Unity MonoDevelop autocompletes this as "SystemInfo" or "SystemLanguage" but just plain "System" is not available.

And again, if I delete all my old MonoDevelop-Unity preferences (and indeed, reinstall Unity from scratch) and allow them to autopopulate I lose all my intellisense including the UnityEngine and UnityEditor classes.

I suppose I could yet again grab the latest files from my coleague if he's already successfully updated his Unity install, but that's no way to solve this issue and is not sustainable.


Has anyone encountered any problems with the autocomplete feature of the MonoDevelop install that comes with Unity 3.3 on Mac 10.6.7? For reference, it's a version of MonoDevelop 2.4.2.

The autocomplete / intellisense won't actually show any code hints at all except for local variables/methods and static variables/methods that are in the current Class's definition.

By comparison, the "real" version of MonoDevelop has perfectly working autocomplete, but it's not usable by Unity in any real way, so I'm stuck with the broken Unity version.

How can I solve this problem? Working intellisense is very important to me.


After trying kdubb's solution below, I've found that:

  1. MonoDevelop will incorrectly re-generate the pidb files if they don't exist.
  2. MonoDevelop will incorrectly re-generate the entire MonoDevelop-Unity folder if it doesn't exist.
  3. Replacing the MonoDevelop-Unity .pidb files with the ones found in MonoDevelop will give me all the Unity-specific class definitions, but it will NOT give me any definitions from System or its subpackages.
  4. Replacing the entire MonoDevelop-Unity directory with the MonoDevelop directory breaks Unity's MonoDevelop. It fails to open.
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asked May 25, 2011 at 02:08 AM

maskedMan gravatar image

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4 answers: sort voted first

Shutdown MonoDevelop and delete all of the ".pidb" files in every folder of every project in your affected solution(s). Then delete all the ".pidb" files in the CodeCompletionCache (1). This should get things working again.

(1) CodeCompletionCache location: Mac it is at "~/.config/MonoDevelop-Unity/CodeCompletionData", Windows it is at "AppDataMonoDevelop-UnityCodeCompletionData".

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answered May 25, 2011 at 03:29 AM

kdubb gravatar image

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This did not work.

May 25, 2011 at 04:44 PM maskedMan

However this did make me think of something else to try that partially worked. I copied all of the CodeCompletionData from the "normal" MonoDevelop install and replaced the Unity CodeCompletionData with it. This gave me all the UnityEngine (and other Unity-related) autocomplete prompts, but I am still missing all the "normal" C# prompts (eg: it doesn't know about System, System.Collections, List<>, etc). I'm going to try grabbing some definitions from other people to see if they have a set that works for me.

May 25, 2011 at 05:12 PM maskedMan

After grabbing definitions from a co-worker and pasting those into ~/.config/MonoDevelop-Unity/CodeCompletionData I now appear to have autocomplete for both Unity and C# script at last! +1 for leading me down the right path even if the answer appears to be "it's a bug in the Unity monodevelop"

May 25, 2011 at 09:08 PM maskedMan

Thanks for the +1. Although it seems weird that you cannot get your MD-U to build those symbols automagically. Here's another idea... have you recently changed the location of your Unity install? I believe that the solution have hardcoded references to the .Net and Unity assemblies and maybe your MD is pointing to the wrong place now?

May 25, 2011 at 11:19 PM kdubb

No, both Unity and MD-U are in their default locations. Additionally, I did not choose an alternative location during the install process.

May 25, 2011 at 11:25 PM maskedMan
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you missing "using UnityEngine;" at the beginning of the script.

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answered Dec 10, 2013 at 07:10 AM

haim96 gravatar image

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Im having the the same problem also

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answered Nov 13, 2013 at 02:56 AM

defsine gravatar image


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Move MonoDevelop.app one folder up so it's in the same folder as Unity.app. At least on unity 4.3.1 that's it.

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answered Dec 10, 2013 at 07:03 AM

LuisGuimaraes gravatar image

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This worked like a charm, but it's better not to copy the whole MonoDevelop.app folder. I've just made a link:

  1. Open up Terminal
  2. cd /Applications/Unity
  3. ln -sf MonoDevelop.localized/MonoDevelop.app/ MonoDevelop.app

That will create a symbolic link to the MonoDevelop.app folder :-D

Jan 05 at 11:51 AM dfreniche

It works for me. Also the @dfreniche suggestion is very good - I'm using that approach. It fixes all problem about solution and symbols. I am on a MAC Mini i5 - 16 GB - OSX 10.9.2 - Unity 4.3.4f1.

Apr 24 at 06:14 AM bust76
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asked: May 25, 2011 at 02:08 AM

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Last Updated: Apr 24 at 06:14 AM