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sure, what does this mean and what can i do?

May I ask which part of
&gt; Gradle build daemon disappeared unexpectedly (it may have been killed or may have crashed)
&gt; 
is unclear?

You can look in the daemon logs in `&lt;GRADLE_USER_HOME&gt;/daemon/` whether you find more information that couldn't be sent to the client. But usually this happens - just like the error describes - when the daemon is killed.
A typical case is if the OOM killer on Linux killed it, check your system log files for that.