Describe the bug
Latest plugin version:

2019-03-07 11:17:59,261 [ 317275] ERROR - tartup.impl.StartupManagerImpl - Method com.intellij.openapi.roots.impl.libraries.ProjectLibraryTable.getInstance(Lcom/intellij/openapi/project/Project;)Lcom/intellij/openapi/roots/libraries/LibraryTable; must be InterfaceMethodref
java.lang.IncompatibleClassChangeError: Method com.intellij.openapi.roots.impl.libraries.ProjectLibraryTable.getInstance(Lcom/intellij/openapi/project/Project;)Lcom/intellij/openapi/roots/libraries/LibraryTable; must be InterfaceMethodref
at io.protostuff.jetbrains.plugin.ProtostuffPluginController.findGlobalProtobufLibrary(ProtostuffPluginController.java:171)
at io.protostuff.jetbrains.plugin.ProtostuffPluginController.updateGlobalLibrary(ProtostuffPluginController.java:140)
at io.protostuff.jetbrains.plugin.ProtostuffPluginController.projectOpened(ProtostuffPluginController.java:87)

To Reproduce
Steps to reproduce the behavior:

• Happens on IDE startup