When I run IntelliJ on Linux Mint, I get an warning on the terminal screen.
/IDEA/idea-IU-141.178.9/bin $ ./idea.sh
[ 47358] WARN - om.intellij.util.ProfilingUtil - Profiling agent is not enabled. Add -agentlib:yjpagent to idea.vmoptions if necessary to profile IDEA.
[ 63287] WARN - .ExternalResourceManagerExImpl - Cannot find standard resource. filename:/META-INF/tapestry_5_3.xsd class=class com.intellij.javaee.ResourceRegistrarImpl, classLoader:null
I'm using Java 8 64-bit. I thing that this error is leading to some CSS loading problem.
Does anyone know what's going on with this?
It's not an error, it's a warning.
You don't have the built-in profiler enabled so that you can get diagnostics like CPU and memory usage, which are useful for when IntelliJ becomes unresponsive or sluggish.
Don't worry about it; if you don't encounter a lot of startup pain, then it's not anything critical. If you do require the profiler enabled, then you can follow the instructions here to add the appropriate run time flags to your executable.