[Error] Uninitialized constant Essentials

[SoulArquero]

Hey guys, got a problem. I got an 'script 'errors' line 34: NameError Occured.
Uninitialized constant Essentials' kind of error.
I know nothing about programming in Ruby, could someone help me out?

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Debug Output:
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*** Checking plugins ***

Exception `NameError' at 008:PluginManager:637 - uninitialized constant PluginManager::Essentials
Exception `NameError' at 014:Errors:34 - uninitialized constant Essentials
014:Errors:34:in `pbPrintException': uninitialized constant Essentials (NameError)
from 014:Errors:87:in `rescue in pbCriticalCode'
from 014:Errors:79:in `pbCriticalCode'
from 386:Main:18:in `mainFunction'
from 386:Main:45:in `block in <main>'
from 386:Main:44:in `loop'
from 386:Main:44:in `<main>'