Upsource doesn't start anymore

Hey!

We have been using Upsource for two weeks now and we really like it so far. 

Yesterday we've added another project and now it seems that Upsource isn't starting anymore. After performing the $<upsourcehome>/bin/upsource.sh start command, the browser opens and gets stuck while starting apache cassandra database. 

I tried this:  https://www.jetbrains.com/help/upsource/cassandra-database-won-t-start-when-upsource-launched.html  and set the heap size for cassandra to 5000m, it still doesn't work. Now I cant even kill the process anymore, without restarting the whole machine. When I run the stop command, I eventually get this error message:

cassandra: [Apache Cassandra Error] 2020-05-19T14:50:36,938 [[APP-WRAPPER] Proxy 1] WARN o.a.cassandra.service.StartupChecks - jemalloc shared library could not be preloaded to speed up memory allocations
cassandra: [Apache Cassandra Error] 2020-05-19T14:50:36,938 [[APP-WRAPPER] Proxy 1] WARN o.a.cassandra.service.StartupChecks - JMX is not enabled to receive remote connections. Please see cassandra-env.sh for more info.
cassandra: [Apache Cassandra Error] 2020-05-19T14:50:36,939 [[APP-WRAPPER] Proxy 1] WARN o.a.cassandra.service.StartupChecks - The JVM is not configured to stop on OutOfMemoryError which can cause data corruption. Use one of the following JVM options to configure the behavior on OutOfMemoryError: -XX:+ExitOnOutOfMemoryError, -XX:+CrashOnOutOfMemoryError, or -XX:OnOutOfMemoryError="<cmd args>;<cmd args>"

And I dont know what to do with it. 

Any help would be greatly appreciated!