The error relates to the LyricsReloaded plugin you recently installed. I don't know exactly what the error is, but if it's preventing MB from starting, go to the plugins directory and delete mb_LyricsReloaded.dll. That should let you start MB.
Was this the first time you launched MB after installing the plugin?
Someone else, either frankz (the plugin developer) or Steven (MB's developer) will have to explain and/or fix the error.