[Vue warn]: Cannot find element: #app

[jflaflamme]

Hello,

I am getting [Vue warn]: Cannot find element: #app when launching. In HTML, I see the app element correctly.
Of course, the rest of my app doesn't work because of that.

On the console, I see

[12439:0226/102036.363381:ERROR:CONSOLE(5738)] "SyntaxError: Unexpected token < in JSON at position 0", source: devtools://devtools/bundled/shell.js (5738) [12439:0226/102036.364405:ERROR:CONSOLE(5738)] "SyntaxError: Unexpected token < in JSON at position 0", source: devtools://devtools/bundled/shell.js (5738) [12439:0226/102036.384481:ERROR:CONSOLE(5738)] "SyntaxError: Unexpected token < in JSON at position 0", source: devtools://devtools/bundled/shell.js (5738) [12439:0226/102036.385640:ERROR:CONSOLE(5738)] "SyntaxError: Unexpected token < in JSON at position 0", source: devtools://devtools/bundled/shell.js (5738)

npm version { npm: '7.4.0', node: '15.6.0', v8: '8.6.395.17-node.23', uv: '1.40.0', zlib: '1.2.11', brotli: '1.0.9', ares: '1.17.1', modules: '88', nghttp2: '1.42.0', napi: '7', llhttp: '2.1.3', openssl: '1.1.1i', cldr: '37.0', icu: '67.1', tz: '2019c', unicode: '13.0'

Is it an issue with the firing sequence?