yarn run webpack:build.
yarn install. If you are behind a corporate proxy, it is likely that this error was caused by your proxy. Have a look at the OncoKB error logs, you will probably have the cause of the error.
If you want to go fast, run
./mvnw to build and run everything.
yarn run webpack:buildor
./mvnwor using your IDE
Please send us an email at firstname.lastname@example.org