Classpath issue in custom maven plugin

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[WARNING] Some problems were encountered while building the effective model for com.github.kongchen:swagger-maven-plugin:maven-plugin:1.0-SNAPSHOT
[WARNING] 'parent.relativePath' points at com.thed:dtr instead of org.sonatype.oss:oss-parent, please verify your project structure @ line 3, column 13
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[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
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[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
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