atg.endeca.assembler.configuration.PerEndecaApplicationGenericReference.doStartService exception

While trying to access a endeca page through ATG , getting below error :

11:49:11,378 ERROR [atg.endeca.assembler.droplet.InvokeAssembler] (http-localhost/127.0.0.1:11080-1) JSESSIONID:vS1ZtSqhqEGBgoqTq0ps6nCN.localhost, PROFILE_ID:2149866307, APACHE_UNIQUE_ID:null, SOURCE_IP:null, Client-Source-IP:null, Servicing ‘error’ oparam. An exception occurred invoking the Assembler with ContentItem {@type=ContentSlot, ruleLimit=1, contentCollection=/content/COM/Contents/SharedContents/HeaderContent}com.endeca.infront.assembler.AssemblerException: java.lang.NullPointerException
at com.endeca.infront.assembler.support.AbstractAssembler.assemble(AbstractAssembler.java:112)
at atg.endeca.assembler.AssemblerTools.invokeAssembler(AssemblerTools.java:435)
at atg.endeca.assembler.droplet.InvokeAssembler.invokeAssembler(InvokeAssembler.java:324)
at atg.endeca.assembler.droplet.InvokeAssembler.service(InvokeAssembler.java:232)
at atg.servlet.DynamoServlet.service(DynamoServlet.java:152)
…. 114 more
Caused By: java.lang.NullPointerException
at atg.endeca.assembler.configuration.PerEndecaApplicationGenericReference.getComponentPathSuffix(PerEndecaApplicationGenericReference.java:137)
at atg.nucleus.ContextualSuffixGenericReference.resolveName(ContextualSuffixGenericReference.java:155)
at atg.nucleus.GenericReference.doStartService(GenericReference.java:236)
at atg.endeca.assembler.configuration.PerEndecaApplicationGenericReference.doStartService(PerEndecaApplicationGenericReference.java:153)
at atg.nucleus.GenericService.startService(GenericService.java:561)
…. 147 more

What would cause this