Runtime error while running spec tests

[Sandeep Rajendran]

I am trying to run some of the tests under /src/test/scala/coverage/CoverageSpec.scala. But I run into a runtime error:

[info] ISAMiniCoverageSpec:
[info] coverage.ISAMiniCoverageSpec *** ABORTED ***
[info]   java.lang.ClassCastException: cannot assign instance of scala.collection.immutable.List$SerializationProxy to field firrtl.annotations.ReferenceTarget.component of type scala.collection.Seq in instance of firrtl.annotations.ReferenceTarget
[info]   at java.io.ObjectStreamClass$FieldReflector.setObjFieldValues(ObjectStreamClass.java:2287)
[info]   at java.io.ObjectStreamClass.setObjFieldValues(ObjectStreamClass.java:1417)
[info]   at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2293)
[info]   at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2211)
[info]   at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2069)
[info]   at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1573)
[info]   at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2287)
[info]   at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2211)
[info]   at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2069)
[info]   at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1573)
[info]   ...
[info] ScalaTest
[info] Run completed in 2 seconds, 632 milliseconds.
[info] Total number of tests run: 0
[info] Suites: completed 0, aborted 1
[info] Tests: succeeded 0, failed 0, canceled 0, ignored 0, pending 0
[info] *** 1 SUITE ABORTED ***

The steps I took to run this were:

sbt -mem 4096
compile
test:compile
testOnly coverage.ISAMiniCoverageSpec

Please let me know if I have missed some steps or if there is another way to run these tests.