Warning when usin web components

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Warning 1:

lit-html.ts:224 Lit is in dev mode. Not recommended for production! See https://lit.dev/msg/dev-mode for more information.
issueWarning @ lit-html.ts:224
(anonymous) @ lit-html.ts:229

Warning2:
reactive-element.ts:75 Multiple versions of Lit loaded. Loading multiple versions is not recommended. See https://lit.dev/msg/multiple-versions for more information.
issueWarning @ reactive-element.ts:75
(anonymous) @ reactive-element.ts:1554