I copied a plugin template and forgot to change the name.
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Construct 2 Check failure
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Check failure! This is probably a bug:
Duplicate plugin ID specified; check all ID strings are unique
Condition: plugins_by_id.find(cr::ToLower(plugin->GetID())) == plugins_by_id.end()
File: html5.cpp
Line: 188
Function: void __thiscall Exporter::LoadPluginsAndBehaviors(void)
Build: release 50 (32-bit) checked
Component: HTML5 exporter
(Last Win32 error: 0)