报错内容如下，求原因
com.primeton.governor.user.UserManage.flow
/governor/governor/user/clearSession.jsp
[BPS Process Server][2021-03-18 13:24:24,168][INFO] Timer trig first:180000 3000
[governor][2021-03-18 13:32:29,723][ERROR][com.primeton.ext.access.http.processor.MultipartResolver:212]
java.lang.NullPointerException
at com.primeton.ext.access.http.processor.MultipartResolver.resolveMultipart(MultipartResolver.java:113)
at com.primeton.ext.engine.core.processor.AbstractPageFlowProcessor.process(AbstractPageFlowProcessor.java:107)
at com.primeton.access.http.impl.ProcessorWebInterceptor.doIntercept(ProcessorWebInterceptor.java:105)
at com.primeton.access.http.impl.WebInterceptorChainImpl.doIntercept(WebInterceptorChainImpl.java:56)
at com.primeton.access.authorization.impl.AccessedHttpResourceFilter.doIntercept(AccessedHttpResourceFilter.java:131)
at com.primeton.access.http.impl.WebInterceptorChainImpl.doIntercept(WebInterceptorChainImpl.java:56)
at com.eos.access.http.UserLoginCheckedFilter.doIntercept(UserLoginCheckedFilter.java:147)
at com.primeton.access.http.impl.WebInterceptorChainImpl.doIntercept(WebInterceptorChainImpl.java:56)
at com.eos.access.http.security.HttpRefererWebInterceptor.doIntercept(HttpRefererWebInterceptor.java:47)
at com.primeton.access.http.impl.WebInterceptorChainImpl.doIntercept(WebInterceptorChainImpl.java:56)
at com.eos.access.http.security.HttpSecurityWebInterceptor.doIntercept(HttpSecurityWebInterceptor.java:40)
at com.primeton.access.http.impl.WebInterceptorChainImpl.doIntercept(WebInterceptorChainImpl.java:56)
at com.primeton.access.http.impl.WebI18NInterceptor.doIntercept(WebI18NInterceptor.java:64)
at com.primeton.access.http.impl.WebInterceptorChainImpl.doIntercept(WebInterceptorChainImpl.java:56)
at com.primeton.sca.host.webapp.SCAWebServiceServletFilter.doIntercept(SCAWebServiceServletFilter.java:133)
at com.primeton.access.http.impl.WebInterceptorChainImpl.doIntercept(WebInterceptorChainImpl.java:56)
at com.eos.access.http.InterceptorFilter.doFilter(InterceptorFilter.java:120)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:108)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:784)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:802)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1410)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
我之前上传附件报错，是因为索引导致的，你可以看看你的