when export, I get: TypeError: Cannot read property 'type_' of undefined

[techloghub]

I want to export all my notes into my disk, then I clicked the export menu on joplin-desktop to export as md files, and after a little while, I got this tips:

And I did not give up, I tried to install joplin console, and ran the command, and I saw:

Environment

Joplin version: [desktop] Joplin 1.0.227 (prod, linux); [console] joplin 1.0.165 (prod)
Platform: linux, ubuntu x86_64 5.4.0-45-generic
OS specifics: ubuntu-mate 20.04

Describe what you expected to happen

Logfile

TypeError: Cannot read property 'type_' of undefined
    at InteropService_Exporter_Md.makeDirPath_ (/home/zeyu/.joplin-bin/lib/node_modules/joplin/lib/services/InteropService_Exporter_Md.js:21:13)
    at process._tickCallback (internal/process/next_tick.js:68:7)
TypeError: Cannot read property 'type_' of undefined
    at InteropService_Exporter_Md.makeDirPath_ (/home/zeyu/.joplin-bin/lib/node_modules/joplin/lib/services/InteropService_Exporter_Md.js:21:13)
    at process._tickCallback (internal/process/next_tick.js:68:7)
TypeError: Cannot read property 'type_' of undefined
    at InteropService_Exporter_Md.makeDirPath_ (/home/zeyu/.joplin-bin/lib/node_modules/joplin/lib/services/InteropService_Exporter_Md.js:21:13)
    at process._tickCallback (internal/process/next_tick.js:68:7)
Cannot read property 'type_' of undefined