Hi, try looking through your download's and finding the plugins you downloaded from BSMC. The files should have -CRACKED at the end of them, from there you need to find which plugins are on your server.
Take them all out of your server and add one at a time until you find the culprit.
Also there has been an issue lately that support for Java 9 has been quite broken. If you happen to be using Java 9, I recommend you downgrade to Java 8, that could even fix your issue.