Everytime I attempt to run Minecraft it crashes and I get this message.

Exception in thread "main" java.lang.ExceptionInInitializerError
at org.apache.logging.log4j.util.PropertiesUtil.<init>(PropertiesUtil.java:71)
at org.apache.logging.log4j.util.PropertiesUtil.<clinit>(PropertiesUtil.java:31)
at org.apache.logging.log4j.status.StatusLogger.<clinit>(StatusLogger.java:48)
at org.apache.logging.log4j.LogManager.<clinit>(LogManager.java:44)
at avf.<clinit>(SourceFile:145)
at net.minecraft.client.main.Main.main(SourceFile:41)
Caused by: java.lang.NullPointerException
at org.apache.logging.log4j.util.ProviderUtil.<clinit>(ProviderUtil.java:70)
... 6 more
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release