import pdf error

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Hi, I can't import pdf file, but I can import other file( word, html) and export to pdf, follow is the error output:

com.sun.star.task.ErrorCodeIOException: at com.sun.star.lib.uno.environments.remote.Job.remoteUnoRequestRaisedException(Job.java:180) at com.sun.star.lib.uno.environments.remote.Job.execute(Job.java:146) at com.sun.star.lib.uno.environments.remote.JobQueue.enter(JobQueue.java:338) at com.sun.star.lib.uno.environments.remote.JobQueue.enter(JobQueue.java:307) at com.sun.star.lib.uno.environments.remote.JavaThreadPool.enter(JavaThreadPool.java:94) at com.sun.star.lib.uno.bridges.java_remote.java_remote_bridge.sendRequest(java_remote_bridge.java:642) at com.sun.star.lib.uno.bridges.java_remote.ProxyFactory$Handler.request(ProxyFactory.java:154) at com.sun.star.lib.uno.bridges.java_remote.ProxyFactory$Handler.invoke(ProxyFactory.java:136) at $Proxy9.storeToURL(Unknown Source) at com.etherpad.openofficeservice.OpenOfficeFileConverter.convertFile(importexport.scala:115) at com.etherpad.openofficeservice.OpenOfficeService$.convertFile(importexport.scala:194) at com.etherpad.openofficeservice.OpenOfficeService.convertFile(importexport.scala) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:160) at org.mozilla.javascript.NativeJavaMethod.call(NativeJavaMethod.java:243) at org.mozilla.javascript.optimizer.OptRuntime.callN(OptRuntime.java:86) at JS$module$etherpad$importexport$importexport$js$137._c9(module etherpad/importexport/importexport.js:148) at JS$module$etherpad$importexport$importexport$js$137.call(module etherpad/importexport/importexport.js) at org.mozilla.javascript.optimizer.OptRuntime.callName(OptRuntime.java:97) at JS$module$etherpad$importexport$importexport$js$137._c7(module etherpad/importexport/importexport.js:88) at JS$module$etherpad$importexport$importexport$js$137.call(module etherpad/importexport/importexport.js) at org.mozilla.javascript.optimizer.OptRuntime.callN(OptRuntime.java:86) at JS$module$main$js$8._c12(module main.js:165) at JS$module$main$js$8.call(module main.js) at org.mozilla.javascript.ScriptRuntime.applyOrCall(ScriptRuntime.java:2348) at org.mozilla.javascript.BaseFunction.execIdCall(BaseFunction.java:272) at org.mozilla.javascript.IdFunctionObject.call(IdFunctionObject.java:127) at org.mozilla.javascript.optimizer.OptRuntime.call2(OptRuntime.java:76) at JS$module$onscheduledtask$js$172._c1(module onscheduledtask.js:32) at JS$module$onscheduledtask$js$172.call(module onscheduledtask.js) at org.mozilla.javascript.optimizer.OptRuntime.call0(OptRuntime.java:57) at JS$module$onscheduledtask$js$172._c0(module onscheduledtask.js:17) at JS$module$onscheduledtask$js$172.call(module onscheduledtask.js) at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:401) at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3004) at JS$module$onscheduledtask$js$172.call(module onscheduledtask.js) at JS$module$onscheduledtask$js$172.exec(module onscheduledtask.js) at net.appjet.bodylock.InnerExecutable$$anonfun$execute$1.apply(bodylock.scala:76) at net.appjet.bodylock.InnerExecutable$$anonfun$execute$1.apply(bodylock.scala:75) at net.appjet.bodylock.BodyLock$.runInContext(bodylock.scala:111) at net.appjet.bodylock.InnerExecutable.execute(bodylock.scala:75) at net.appjet.oui.execution$$anonfun$execute$4.apply(execution.scala:508) at net.appjet.oui.NoninheritedDynamicVariable.withValue(dynamicvar.scala:38) at net.appjet.oui.ExecutionContextUtils$.withContext(execution.scala:334) at net.appjet.oui.execution$.execute(execution.scala:504) at net.appjet.oui.execution$.runOutOfBand(execution.scala:631) at net.appjet.ajstdlib.execution$.runTask(ajstdlib.scala:140) at net.appjet.ajstdlib.execution$TaskRunner.call(ajstdlib.scala:177) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:206) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) com.etherpad.openofficeservice.OOSException: Unknown exception occurred: at com.etherpad.openofficeservice.OpenOfficeFileConverter.convertFile(importexport.scala:122) at com.etherpad.openofficeservice.OpenOfficeService$.convertFile(importexport.scala:194) at com.etherpad.openofficeservice.OpenOfficeService.convertFile(importexport.scala) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:160) at org.mozilla.javascript.NativeJavaMethod.call(NativeJavaMethod.java:243) at org.mozilla.javascript.optimizer.OptRuntime.callN(OptRuntime.java:86) at JS$module$etherpad$importexport$importexport$js$137._c9(module etherpad/importexport/importexport.js:148) at JS$module$etherpad$importexport$importexport$js$137.call(module etherpad/importexport/importexport.js) at org.mozilla.javascript.optimizer.OptRuntime.callName(OptRuntime.java:97) at JS$module$etherpad$importexport$importexport$js$137._c7(module etherpad/importexport/importexport.js:88) at JS$module$etherpad$importexport$importexport$js$137.call(module etherpad/importexport/importexport.js) at org.mozilla.javascript.optimizer.OptRuntime.callN(OptRuntime.java:86) at JS$module$main$js$8._c12(module main.js:165) at JS$module$main$js$8.call(module main.js) at org.mozilla.javascript.ScriptRuntime.applyOrCall(ScriptRuntime.java:2348) at org.mozilla.javascript.BaseFunction.execIdCall(BaseFunction.java:272) at org.mozilla.javascript.IdFunctionObject.call(IdFunctionObject.java:127) at org.mozilla.javascript.optimizer.OptRuntime.call2(OptRuntime.java:76) at JS$module$onscheduledtask$js$172._c1(module onscheduledtask.js:32) at JS$module$onscheduledtask$js$172.call(module onscheduledtask.js) at org.mozilla.javascript.optimizer.OptRuntime.call0(OptRuntime.java:57) at JS$module$onscheduledtask$js$172._c0(module onscheduledtask.js:17) at JS$module$onscheduledtask$js$172.call(module onscheduledtask.js) at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:401) at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3004) at JS$module$onscheduledtask$js$172.call(module onscheduledtask.js) at JS$module$onscheduledtask$js$172.exec(module onscheduledtask.js) at net.appjet.bodylock.InnerExecutable$$anonfun$execute$1.apply(bodylock.scala:76) at net.appjet.bodylock.InnerExecutable$$anonfun$execute$1.apply(bodylock.scala:75) at net.appjet.bodylock.BodyLock$.runInContext(bodylock.scala:111) at net.appjet.bodylock.InnerExecutable.execute(bodylock.scala:75) at net.appjet.oui.execution$$anonfun$execute$4.apply(execution.scala:508) at net.appjet.oui.NoninheritedDynamicVariable.withValue(dynamicvar.scala:38) at net.appjet.oui.ExecutionContextUtils$.withContext(execution.scala:334) at net.appjet.oui.execution$.execute(execution.scala:504) at net.appjet.oui.execution$.runOutOfBand(execution.scala:631) at net.appjet.ajstdlib.execution$.runTask(ajstdlib.scala:140) at net.appjet.ajstdlib.execution$TaskRunner.call(ajstdlib.scala:177) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:206) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662)

Would someone suggest it?

Thanks much. Alfred