I went out for sometime(no change in code) and now struggling with this issue.

[ankit@fedora supertokens-auth-react]$ npm run start

> supertokens-auth-react@0.18.4 start
> npm-run-all --parallel front server watch


> supertokens-auth-react@0.18.4 server
> cd test/server/ && START=true INSTALL_PATH=../../../supertokens-root NODE_PORT=8082 node .


> supertokens-auth-react@0.18.4 front
> (cd ./examples/for-tests/ && BROWSER=none PORT=3031 npm run start)


> supertokens-auth-react@0.18.4 watch
> cd lib && npx tsc -w -p tsconfig_dev.json


> react-test-app@0.1.0 start
> PORT=3031 react-scripts start

Start supertokens for test app
node:child_process:397
      ex = new Error('Command failed: ' + cmd + '\n' + stderr);
           ^

Error: Command failed: cd ../../../supertokens-root && java -Djava.security.egd=file:/dev/urandom -classpath "./core/*:./plugin-interface/*" io.supertokens.Main ./ DEV host=localhost port=9000
Error: Could not find or load main class io.supertokens.Main
Caused by: java.lang.ClassNotFoundException: io.supertokens.Main

    at ChildProcess.exithandler (node:child_process:397:12)
    at ChildProcess.emit (node:events:390:28)
    at maybeClose (node:internal/child_process:1064:16)
    at Socket.<anonymous> (node:internal/child_process:450:11)
    at Socket.emit (node:events:390:28)
    at Pipe.<anonymous> (node:net:687:12) {
  killed: false,
  code: 1,
  signal: null,
  cmd: 'cd ../../../supertokens-root && java -Djava.security.egd=file:/dev/urandom -classpath "./core/*:./plugin-interface/*" io.supertokens.Main ./ DEV host=localhost port=9000'
}
ERROR: "server" exited with 1.