FM2020: 'dialog' plugin(Error:Cannot initialize API client...)

Hi.

I am using FrameMaker2020(64-bit version), and I want to run the "dialog" plugin in the FDK.
I have compiled the 'dialog' plugin using Visual studio 2019,
and I set the dialog.dll to fminit\Plugins folder.
But when I start FM2020, the following message was shown.

I know I need to compile the plugin for 64-bit.
I changed all '.\debug/' to '.\x64\Debug/' in the project property window.
Are there other settings that need to be changed?