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You are probably requiring the bootstrap URL. There is no need for that.
You either use the vue-boostrap package or include the necessary files in your index.html via old plain HTML tags.
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You seem to be using Bootstrap3 and not Bootstrap4. From the issue that you have shown, it looks like you have made some changes to package.json dependencies section and have not rerun npm install. Can you do that and retry?
Source:stackexchange.com