IntelliJ: "java connot find symbol class" when class is in same package

Question

I have 2 classes in the same package:

com.infinity.sparkler.SparkDevice
com.infinity.sparkler.SparkCloudSession

SparkDevice uses SparkCloudSession but the IntelliJ compiler all of a sudden can't find SparkCloudSession. It was working fine and then seemingly randomly stopped. The real-time compiler still works and thinks everything is fine.

Error:(5, 13) java: cannot find symbol
  symbol:   class SparkCloudSession
  location: class com.infinity.sparkler.SparkDevice
Error:(13, 35) java: cannot find symbol
  symbol:   class SparkCloudSession
  location: class com.infinity.sparkler.SparkDevice
Error:(9, 23) java: cannot find symbol
  symbol:   class SparkCloudSession
  location: class com.infinity.sparkler.SparkDevice

The two classes in question can be found here (along with the whole project): http://github.com/grantwest/Sparkler/tree/master/src/main/java/com/infinity/sparkler

Things I have tried:

• Made sure the right folders have been marked as Sources Root & Test Sources Root
• Deleted all of the binaries and tried to re-compile.
• Invalidated the IntelliJ cache and rebooted my machine.

Answer 1

Somehow a couple lines made it into my .idea/compiler.xml

<excludeFromCompile>
<file url="file://$PROJECT_DIR$/src/main/java/com/infinity/sparkler/SparkCloudSession.java" />
</excludeFromCompile>

I closed the project, deleted compiler.xml and when I reopened the project a new compiler.xml was generated and the project compiled without any issues.