Errors running builder 'Maven Project Builder' on project in eclipse -

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i want create liferay plugin portlet using liferay-maven-plugin in eclipse every time try got error :

errors occurred during build. errors running builder 'maven project builder' on project 'sample-portlet'. not calculate build plan: plugin com.liferay.maven.plugins:liferay-maven-plugin:6.2.1 or 1 of dependencies not resolved: failure find com.liferay.maven.plugins:liferay-maven-plugin:jar:6.2.1 in http://repo.maven.apache.org/maven2 cached in local repository, resolution not reattempted until update interval of central has elapsed or updates forced plugin com.liferay.maven.plugins:liferay-maven-plugin:6.2.1 or 1 of dependencies not resolved: failure find com.liferay.maven.plugins:liferay-maven-plugin:jar:6.2.1 in http://repo.maven.apache.org/maven2 cached in local repository, resolution not reattempted until update interval of central has elapsed or updates forced not calculate build plan: plugin com.liferay.maven.plugins:liferay-maven-plugin:6.2.1 or 1 of dependencies not resolved: failure find com.liferay.maven.plugins:liferay-maven-plugin:jar:6.2.1 in http://repo.maven.apache.org/maven2 cached in local repository, resolution not reattempted until update interval of central has elapsed or updates forced plugin com.liferay.maven.plugins:liferay-maven-plugin:6.2.1 or 1 of dependencies not resolved: failure find com.liferay.maven.plugins:liferay-maven-plugin:jar:6.2.1 in http://repo.maven.apache.org/maven2 cached in local repository, resolution not reattempted until update interval of central has elapsed or updates forced


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