java - wro4j sass preprocessor throwing exception in spring integration -

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i working on adding sass support css, , added sasscss preprocessor configuration, not working expected rather throwing exception

ro.isdc.wro.extensions.processor.css.sasscssprocessor@18f6b97. reason: bad language version: 180

here exception:

    severe: exception occured ro.isdc.wro.wroruntimeexception: processor: ro.isdc.wro.extensions.processor.css.sasscssprocessor@18f6b97 faile while processing uri: /css/framework/reset.2.css     @ ro.isdc.wro.wroruntimeexception.wrap(wroruntimeexception.java:69)     @ ro.isdc.wro.model.resource.processor.decorator.exceptionhandlingprocessordecorator.process(exceptionhandlingprocessordecorator.java:67)     @ ro.isdc.wro.model.resource.processor.decorator.processordecorator.process(processordecorator.java:86)     @ ro.isdc.wro.model.resource.processor.decorator.benchmarkprocessordecorator.process(benchmarkprocessordecorator.java:44)     @ ro.isdc.wro.model.resource.processor.decorator.processordecorator.process(processordecorator.java:86)     @ ro.isdc.wro.model.resource.processor.decorator.defaultprocessordecorator.process(defaultprocessordecorator.java:42)     @ ro.isdc.wro.model.group.processor.preprocessorexecutor$2.process(preprocessorexecutor.java:228)     @ ro.isdc.wro.model.group.processor.preprocessorexecutor.applypreprocessors(preprocessorexecutor.java:207)     @ ro.isdc.wro.model.group.processor.preprocessorexecutor.processandmerge(preprocessorexecutor.java:103)     @ ro.isdc.wro.model.group.processor.preprocessorexecutor.processandmerge(preprocessorexecutor.java:77)     @ ro.isdc.wro.model.group.processor.groupsprocessor.process(groupsprocessor.java:83)     @ ro.isdc.wro.cache.support.defaultsynchronizedcachestrategydecorator.loadvalue(defaultsynchronizedcachestrategydecorator.java:101)     @ ro.isdc.wro.cache.support.defaultsynchronizedcachestrategydecorator.loadvalue(defaultsynchronizedcachestrategydecorator.java:35)     @ ro.isdc.wro.cache.support.abstractsynchronizedcachestrategydecorator.get(abstractsynchronizedcachestrategydecorator.java:55)     @ ro.isdc.wro.manager.resourcebundleprocessor.serveprocessedbundle(resourcebundleprocessor.java:63)     @ ro.isdc.wro.manager.wromanager.process(wromanager.java:159)     @ ro.isdc.wro.http.wrofilter.processrequest(wrofilter.java:339)     @ ro.isdc.wro.http.wrofilter.dofilter(wrofilter.java:294)     @ org.springframework.web.filter.delegatingfilterproxy.invokedelegate(delegatingfilterproxy.java:343)     @ org.springframework.web.filter.delegatingfilterproxy.dofilter(delegatingfilterproxy.java:260)     @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:241)     @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:208)     @ org.apache.catalina.core.standardwrappervalve.invoke(standardwrappervalve.java:218)     @ org.apache.catalina.core.standardcontextvalve.invoke(standardcontextvalve.java:122)     @ org.apache.catalina.authenticator.authenticatorbase.invoke(authenticatorbase.java:505)     @ org.apache.catalina.core.standardhostvalve.invoke(standardhostvalve.java:169)     @ org.apache.catalina.valves.errorreportvalve.invoke(errorreportvalve.java:103)     @ org.apache.catalina.valves.accesslogvalve.invoke(accesslogvalve.java:956)     @ org.apache.catalina.core.standardenginevalve.invoke(standardenginevalve.java:116)     @ org.apache.catalina.connector.coyoteadapter.service(coyoteadapter.java:442)     @ org.apache.coyote.http11.abstracthttp11processor.process(abstracthttp11processor.java:1082)     @ org.apache.coyote.abstractprotocol$abstractconnectionhandler.process(abstractprotocol.java:623)     @ org.apache.tomcat.util.net.jioendpoint$socketprocessor.run(jioendpoint.java:316)     @ java.util.concurrent.threadpoolexecutor.runworker(unknown source)     @ java.util.concurrent.threadpoolexecutor$worker.run(unknown source)     @ org.apache.tomcat.util.threads.taskthread$wrappingrunnable.run(taskthread.java:61)     @ java.lang.thread.run(unknown source) caused by: java.lang.illegalargumentexception: bad language version: 180     @ org.mozilla.javascript.context.checklanguageversion(context.java:772)     @ org.mozilla.javascript.context.setlanguageversion(context.java:741)     @ ro.isdc.wro.extensions.script.rhinoscriptbuilder.createcontext(rhinoscriptbuilder.java:69)     @ ro.isdc.wro.extensions.script.rhinoscriptbuilder.<init>(rhinoscriptbuilder.java:45)     @ ro.isdc.wro.extensions.script.rhinoscriptbuilder.<init>(rhinoscriptbuilder.java:40)     @ ro.isdc.wro.extensions.script.rhinoscriptbuilder.newchain(rhinoscriptbuilder.java:220)     @ ro.isdc.wro.extensions.processor.support.sass.sasscss.initscriptbuilder(sasscss.java:41)     @ ro.isdc.wro.extensions.processor.support.sass.sasscss.process(sasscss.java:67)     @ ro.isdc.wro.extensions.processor.css.sasscssprocessor.process(sasscssprocessor.java:64)     @ ro.isdc.wro.model.resource.processor.decorator.processordecorator.process(processordecorator.java:86)     @ ro.isdc.wro.model.resource.processor.decorator.lazyprocessordecorator.process(lazyprocessordecorator.java:49)     @ ro.isdc.wro.model.resource.processor.decorator.processordecorator.process(processordecorator.java:86)     @ ro.isdc.wro.model.resource.processor.decorator.processordecorator.process(processordecorator.java:86)     @ ro.isdc.wro.model.resource.processor.decorator.processordecorator.process(processordecorator.java:86)     @ ro.isdc.wro.model.resource.processor.decorator.supportawareprocessordecorator.process(supportawareprocessordecorator.java:39)     @ ro.isdc.wro.model.resource.processor.decorator.processordecorator.process(processordecorator.java:86)     @ ro.isdc.wro.model.resource.processor.decorator.exceptionhandlingprocessordecorator.process(exceptionhandlingprocessordecorator.java:56)     ... 35 more

wro4j version: 1.8.0


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