mill testOnly fail

[pxs7]

gcd.GCDSpec *** ABORTED *** java.lang.NoClassDefFoundError: chisel3/MultiIOModule at chiseltest.internal.VerilatorBackendAnnotation$.(Testers2.scala:127) at chiseltest.internal.VerilatorBackendAnnotation$.(Testers2.scala) at chiseltest.experimental.ChiselTestCli.$init$(ChiselTestShell.scala:16) at chiseltest.experimental.ChiselTestShell.(ChiselTestShell.scala:22) at chiseltest.ChiselScalatestTester$TestBuilder.apply(ChiselScalatestTester.scala:26) at gcd.GCDSpec.$anonfun$new$1(GCDSpec.scala:24) at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23) at org.scalatest.OutcomeOf.outcomeOf(OutcomeOf.scala:85) at org.scalatest.OutcomeOf.outcomeOf$(OutcomeOf.scala:83) at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104) ... Cause: java.lang.ClassNotFoundException: chisel3.MultiIOModule at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:445) at mill.api.ClassLoader$$anon$1.findClass(ClassLoader.scala:47) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:588) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) at chiseltest.internal.VerilatorBackendAnnotation$.(Testers2.scala:127) at chiseltest.internal.VerilatorBackendAnnotation$.(Testers2.scala) at chiseltest.experimental.ChiselTestCli.$init$(ChiselTestShell.scala:16) at chiseltest.experimental.ChiselTestShell.(ChiselTestShell.scala:22) at chiseltest.ChiselScalatestTester$TestBuilder.apply(ChiselScalatestTester.scala:26)

[sequencer]

I didn't see any MultiIOModule usage in this repository. IIRC, it has been deprecated in 3.4, and removed in 3.5.