If you have error - sizeError during initialization of VMinitial heap size set to a larger value than the maximum heap - set RAM to default value in settings or set 1Gb
If you open terminal and it`s empty - just close and open app again and start server
If nothing not working, you can copy text from terminal and use Chatgptto find solution.
In this (Access denied to file in Stream to Earn terminal) and other case if server work before and not start yet, you can just reinstall server, for this you need just open settings -> Install new server -> Select new folder, agree with Eula and Install server
How to reinstall minecraft server in Stream to earn?