[0.23.5] How do I find out what's causing NullReferenceException?

[JawaSP]

Im playing KSP often, and I like playing with mods, but every time I try to recover my Vessel or to go to Space Center, nothing happens. The button get's pressed down, and then goes up again as usual, but nothing happens! I know this is because of the NullReferenceException thingy, but I don't know how I can find out that is causing it in the output_log.txt!

Here is a copy of the "forever" repeating message:

NullReferenceException: Object reference not set to an instance of an object

at ConfigNode.CopyToRecursive (.ConfigNode node) [0x00000] in <filename unknown>:0

at ConfigNode.CopyToRecursive (.ConfigNode node) [0x00000] in <filename unknown>:0

at ConfigNode.CopyToRecursive (.ConfigNode node) [0x00000] in <filename unknown>:0

at ConfigNode.CopyTo (.ConfigNode node) [0x00000] in <filename unknown>:0

at ProtoScenarioModule.Save (.ConfigNode node) [0x00000] in <filename unknown>:0

at Game.Save (.ConfigNode rootNode) [0x00000] in <filename unknown>:0

at GamePersistence.SaveGame (.Game game, System.String saveFileName, System.String saveFolder, SaveMode saveMode) [0x00000] in <filename unknown>:0

at GamePersistence.SaveGame (System.String saveFileName, System.String saveFolder, SaveMode saveMode) [0x00000] in <filename unknown>:0

at VesselRecovery.onVesselRecoveryRequested (.Vessel v) [0x00000] in <filename unknown>:0

at EventData`1[Vessel].Fire (.Vessel data) [0x00000] in <filename unknown>:0

at VesselRecoveryButton.recoverVessel () [0x00000] in <filename unknown>:0

at ScreenSafeUIButton.OnMouseUp (Boolean rightClick) [0x00000] in <filename unknown>:0

at ScreenSafeUIButton.OnMouseUp () [0x00000] in <filename unknown>:0

at SSUICamera.DoMouseEvents () [0x00000] in <filename unknown>:0

at SSUICamera.Update () [0x00000] in <filename unknown>:0

​I know there is supposed to say which file that is causing it, but I can't see it in here!

Please help me with this! It happens all the time! Everytime I complete a mission in Career mod, and collect alot of important science, I can't recover it! It's driving me CrAaAaAaZy!

Edited June 11, 2014 by JawaSP

[regex]

A list of all the mods you have installed would be helpful. What you're probably looking for is something that has an SSUICamera class, although it may not be that mods fault if it works by itself on a clean install.