Assertion failure when loading plugin

[SeanZhang99]

Terminal message: assertion failure: "obj->plugin == nullptr" in file ../../dpf/distrho/src/DistrhoPluginVST.cpp, line 1270

What I did is just replacing plugin_path in example to my own path, and the test plugin is the latest version of dragonfly hall reverb downloaded from https://michaelwillis.github.io/dragonfly-reverb/

But the loaded plugin seems working correctly when calling plugin.get_num_paramters() and plugin.get_parameter_name(0)