Unable to open file for writing. Importing updated

"Unable to open file for writing."

Does anyone know where I can find out why an update will not apply

Command-line that was being run was

osmosis --read-replication-interval workingDirectory=/var/lib/mod_tile/.osmosis --simplify-change --write-xml-change /var/lib/mod_tile/changes.osc.gz

Aug 21, 2019 9:40:12 AM org.openstreetmap.osmosis.core.Osmosis run
INFO: Osmosis Version 0.46
Aug 21, 2019 9:40:12 AM org.java.plugin.registry.xml.ManifestParser <init>
INFO: got SAX parser factory - org.apache.xerces.jaxp.SAXParserFactoryImpl@1e397ed7
Aug 21, 2019 9:40:12 AM org.java.plugin.registry.xml.PluginRegistryImpl configure
INFO: configured, stopOnError=false, isValidating=true
Aug 21, 2019 9:40:12 AM org.java.plugin.registry.xml.PluginRegistryImpl register
INFO: plug-in and fragment descriptors registered - 1
Aug 21, 2019 9:40:12 AM org.java.plugin.standard.StandardPluginManager activatePlugin
INFO: plug-in started - org.openstreetmap.osmosis.core.plugin.Core@0.46.0 (active/total: 1 of 1)
Aug 21, 2019 9:40:12 AM org.openstreetmap.osmosis.core.Osmosis run
INFO: Preparing pipeline.
Aug 21, 2019 9:40:12 AM org.openstreetmap.osmosis.core.Osmosis run
INFO: Launching pipeline execution.
Aug 21, 2019 9:40:12 AM org.openstreetmap.osmosis.core.Osmosis run
INFO: Pipeline executing, waiting for completion.
Aug 21, 2019 9:43:41 AM org.openstreetmap.osmosis.core.pipeline.common.ActiveTaskManager waitForCompletion
SEVERE: Thread for task 1-read-replication-interval failed
org.openstreetmap.osmosis.core.OsmosisRuntimeException: Unable to open file for writing.
    at org.openstreetmap.osmosis.xml.common.BaseXmlWriter.initialize(BaseXmlWriter.java:161)
    at org.openstreetmap.osmosis.xml.v0_6.XmlChangeWriter.process(XmlChangeWriter.java:56)
    at org.openstreetmap.osmosis.set.v0_6.impl.ChangeSimplifierImpl.flushCurrentChanges(ChangeSimplifierImpl.java:60)
    at org.openstreetmap.osmosis.set.v0_6.impl.ChangeSimplifierImpl.process(ChangeSimplifierImpl.java:88)
    at org.openstreetmap.osmosis.core.sort.v0_6.SortedHistoryChangePipeValidator.process(SortedHistoryChangePipeValidator.java:71)
    at org.openstreetmap.osmosis.set.v0_6.ChangeSimplifier.process(ChangeSimplifier.java:50)
    at org.openstreetmap.osmosis.core.sort.v0_6.ChangeSorter.complete(ChangeSorter.java:69)
    at org.openstreetmap.osmosis.replication.v0_6.ReplicationDownloader.processComplete(ReplicationDownloader.java:116)
    at org.openstreetmap.osmosis.replication.v0_6.BaseReplicationDownloader.runImpl(BaseReplicationDownloader.java:280)
    at org.openstreetmap.osmosis.replication.v0_6.BaseReplicationDownloader.run(BaseReplicationDownloader.java:350)
    at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.io.FileNotFoundException: /var/lib/mod_tile/changes.osc.gz (Permission denied)
    at java.base/java.io.FileOutputStream.open0(Native Method)
    at java.base/java.io.FileOutputStream.open(FileOutputStream.java:298)
    at java.base/java.io.FileOutputStream.<init>(FileOutputStream.java:237)
    at java.base/java.io.FileOutputStream.<init>(FileOutputStream.java:187)
    at org.openstreetmap.osmosis.xml.common.BaseXmlWriter.initialize(BaseXmlWriter.java:148)
    ... 10 more

Aug 21, 2019 9:43:41 AM org.openstreetmap.osmosis.core.Osmosis main
SEVERE: Execution aborted.
org.openstreetmap.osmosis.core.OsmosisRuntimeException: One or more tasks failed.
    at org.openstreetmap.osmosis.core.pipeline.common.Pipeline.waitForCompletion(Pipeline.java:146)
    at org.openstreetmap.osmosis.core.Osmosis.run(Osmosis.java:92)
    at org.openstreetmap.osmosis.core.Osmosis.main(Osmosis.java:37)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchStandard(Launcher.java:330)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:238)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
    at org.codehaus.classworlds.Launcher.main(Launcher.java:47)