Weird ClassNotFoundException

Sorry if this has been posted before...

The following exception shows up when running our product, which has nothing to do with IDEA plugin.

Exception "java.lang.ClassNotFoundException: com.intellij.codeInsight.editorActions.TextBlockTransferable$ReferenceData"while constructing DataFlavor for: application/x-java-jvm-local-objectref; class=com.intellij.codeInsight.editorActions.TextBlockTransferable$ReferenceData

Thanks
Shane