npm run webapp:build.
npm install. If you are behind a corporate proxy, it is likely that this error was caused by your proxy. Have a look at the TechsMatch error logs, you will probably have the cause of the error.
If you want to go fast, run
./mvnw to build and run everything.
If you want to have more control, so you can debug your issue more easily, you should follow the following steps:
npm run webapp:buildor
./mvnwor using your IDE
Go to Stack Overflow with the "jhipster" tag.
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