error when doin maven update

hi am eclipse luna am having this error when am doing maven update
mavenmavenCould not get the value for parameter encoding for plugin execution default-resources
Plugin org.apache.maven.plugins:maven-resources-plugin:2.6 or one of its dependencies could not be resolved: Failure to transfer commons-cli:commons-cli:jar:1.0 from was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced. Original error: Could not transfer artifact commons-cli:commons-cli:jar:1.0 from/to central ( Failed to transfer file: Return code is: 504 , ReasonPhrase:Gateway Time-out.
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This is a network error. Can you make sure that you are not behind a firewall or proxy (you might need to define a proxy with user/password)? Can you also try using the IP of the central repository instead of the DNS name and see if it works? For both of the above suggestions you can edit the settings.xml file.

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chalie001Author Commented:
I define a proxy with user/password
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