As of iControlU v1.9.0, LibsDisguises and ProtocolLib are required. You can download them from the links below.
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Download LibsDisguises: http://www.spigotmc.org/resources/libs-disguises.81/update?update=19194
Download ProtocolLib: http://www.spigotmc.org/resources/protocollib.1997/update?update=6907