log4j error when running OpenMRS in intelij

log4j:ERROR Could not create an Appender. Reported error follows.
java.lang.ClassCastException: org.openmrs.util.MemoryAppender cannot be cast to org.apache.log4j.Appender
    at org.apache.log4j.xml.DOMConfigurator.parseAppender(DOMConfigurator.java:238)
    at org.apache.log4j.xml.DOMConfigurator.findAppenderByName(DOMConfigurator.java:171)
    at org.apache.log4j.xml.DOMConfigurator.findAppenderByReference(DOMConfigurator.java:184)
    at org.apache.log4j.xml.DOMConfigurator.parseChildrenOfLoggerElement(DOMConfigurator.java:502)
    at org.apache.log4j.xml.DOMConfigurator.parseRoot(DOMConfigurator.java:471)
    at org.apache.log4j.xml.DOMConfigurator.parse(DOMConfigurator.java:921)
    at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:790)
    at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:696)
    at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:471)
    at org.apache.log4j.LogManager.<clinit>(LogManager.java:125)
    at org.openmrs.module.kenyaemr.EmrActivator.<clinit>(EmrActivator.java:33)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at java.lang.Class.newInstance(Class.java:379)
    at org.openmrs.module.Module.getModuleActivator(Module.java:190)
    at org.openmrs.module.ModuleFactory.startModuleInternal(ModuleFactory.java:618)
    at org.openmrs.api.context.Daemon$1.run(Daemon.java:58)
log4j:ERROR Could not parse url [file:/home/sam/bootcamp/openmrs/openmrs-core/webapp/target/classes/log4j.xml].
java.lang.NullPointerException
    at java.util.Hashtable.put(Hashtable.java:514)
    at org.apache.log4j.xml.DOMConfigurator.findAppenderByName(DOMConfigurator.java:172)
    at org.apache.log4j.xml.DOMConfigurator.findAppenderByReference(DOMConfigurator.java:184)
    at org.apache.log4j.xml.DOMConfigurator.parseChildrenOfLoggerElement(DOMConfigurator.java:502)
    at org.apache.log4j.xml.DOMConfigurator.parseRoot(DOMConfigurator.java:471)
    at org.apache.log4j.xml.DOMConfigurator.parse(DOMConfigurator.java:921)
    at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:790)
    at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:696)
    at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:471)
    at org.apache.log4j.LogManager.<clinit>(LogManager.java:125)
    at org.openmrs.module.kenyaemr.EmrActivator.<clinit>(EmrActivator.java:33)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at java.lang.Class.newInstance(Class.java:379)
    at org.openmrs.module.Module.getModuleActivator(Module.java:190)
    at org.openmrs.module.ModuleFactory.startModuleInternal(ModuleFactory.java:618)
    at org.openmrs.api.context.Daemon$1.run(Daemon.java:58)