Comment 1 for bug 63212

I just experienced the same issue:

** (./MonoDevelop.exe:14831): WARNING **: The following assembly referenced from /usr/lib/monodevelop/bin/MonoDevelop.Core.dll could not be loaded:
     Assembly: log4net (assemblyref_index=5)
     Version: 1.2.9.0
     Public Key: a5715cc6d5c3540b
The assembly was not found in the Global Assembly Cache, a path listed in the MONO_PATH environment variable, or in the location of the executing assembly (/usr/lib/monodevelop/bin).

** (./MonoDevelop.exe:14831): WARNING **: Could not load file or assembly 'log4net, Version=1.2.9.0, Culture=neutral, PublicKeyToken=a5715cc6d5c3540b' or one of its dependencies.

** (./MonoDevelop.exe:14831): WARNING **: Missing method Configure in assembly /usr/lib/monodevelop/bin/MonoDevelop.Core.dll, type log4net.Config.XmlConfigurator

Unhandled Exception: System.ArgumentException: Invalid sequence in conversion input

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Linux version 2.6.17-10-386 (root@palmer) (gcc version 4.1.2 20060928 (prerelease) (Ubuntu 4.1.1-13ubuntu4))