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C# error: InvalidOperationException: Collection was modified; enumeration operation may not execute.

Submitted by Druss on Sat, 2015-05-16 23:54

I was fiddling around with Unity3D (and C#) and I ran into the following error messages:

InvalidOperationException: Collection was modified; enumeration operation may not execute.
System.Collections.Generic.List`1+Enumerator[UnityEngine.UI.Toggle].VerifyState () (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.Collections.Generic/List.cs:778)

and

MySQL: #1071 - Specified key was too long; max key length is 767 bytes

Submitted by Druss on Fri, 2015-04-03 01:33

Here I was simply creating a MySQL (5.5) table when suddenly up pops the following error:

#1071 - Specified key was too long; max key length is 767 bytes

After a little trial and error, I found that since one of my VARCHAR fields was being used for a UNIQUE index, MySQL was basically telling me that it was using too much space. When I reduced the length of this field from its initial 512 setting to 256 & then 255, it still complained. However, reducing it further to 128 fixed the issue!

Desktop effects were restarted due to a graphics reset

Submitted by Druss on Wed, 2015-02-04 01:43

While using Google Chrome on Kubuntu 14.10, the display hung for about 5 seconds before unfreezing with the following notification:

Desktop effects were restarted due to a graphics reset

Once this began occurring with an increasing frequency, I began to do a little digging. Looking through /var/log/kern.log brought the following up:

Eclipse Luna: java: /build/buildd/gtk2-engines-oxygen-1.4.5/src/animations/oxygencomboboxdata.cpp:87: void Oxygen::ComboBoxData::setButton(GtkWidget*): Assertion `!_button._widget' failed.

Submitted by Druss on Mon, 2015-02-02 18:03

After installing the shiny new version of Eclipse entitled 'Luna' on a Kubuntu 14.10 box, I found that it crashed/hung when trying to import/clone a Git repository. Starting the application from the command-line triggered the following notice before the crash:

bash: cannot set terminal process group (3987): Inappropriate ioctl for device bash: no job control in this shell

Submitted by Druss on Wed, 2014-08-20 19:44

On a new Ubuntu 14.04 (Trusty) LTS server, I ran into the following:

$ su -c /bin/bash foo
bash: cannot set terminal process group (3987): Inappropriate ioctl for device
bash: no job control in this shell

However, the su procedure worked and I was logged in as user foo.

Drupal XMLSiteMap: public://xmlsitemap/ not found or not writable

Submitted by Druss on Fri, 2014-04-11 00:48

I ran into the following error (or something like it) while setting up Drupal's xmlsitemap module:

public://xmlsitemap/lOtsOfgoBBlDegOOk not found or not writable

This is as expected some kind of permissions issue. Why the module can't sort this on its own, I do not know. As with everything Drupal, clear the cache first to see if that fixes things. It sometimes does. If not, you will need to get your hands dirty on the commandline (if linux):

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