error when building Grendel

[winter1990]

I followed the steps in Getting Started With Grendel and when I was building Grendel (in step 3), one failure test occurs, so that no JAR file is generated in target file. Could anyone give some advise on how to fix this problem?

this is the information about failure test in the file target/surefire-reports:
Test set: com.wesabe.grendel.openpgp.tests.MessageReaderTest
Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.046 sec <<< FAILURE!
itReadsAnEncryptedMessage(com.wesabe.grendel.openpgp.tests.MessageReaderTest$Reading_An_Encrypted_Message) Time elapsed: 0.042 sec <<< FAILURE!
java.lang.AssertionError: expected:<[84, 104, 105, 115, 32, 105, 115, 32, 98, 97, 115, 105, 99, 97, 108, 108, 121, 32, 97, 32, 116, 101, 115, 116, 46, 13, 10, 13, 10, 87, 104, 97, 116, 32, 100, 111, 32, 121, 111, 117, 32, 116, 104, 105, 110, 107, 63]> but was:<[84, 104, 105, 115, 32, 105, 115, 32, 98, 97, 115, 105, 99, 97, 108, 108, 121, 32, 97, 32, 116, 101, 115, 116, 46, 10, 10, 87, 104, 97, 116, 32, 100, 111, 32, 121, 111, 117, 32, 116, 104, 105, 110, 107, 63]>
at org.fest.assertions.Fail.failure(Fail.java:206)
at org.fest.assertions.Assert.failure(Assert.java:141)
at org.fest.assertions.ByteArrayAssert.isEqualTo(ByteArrayAssert.java:197)
at com.wesabe.grendel.openpgp.tests.MessageReaderTest$Reading_An_Encrypted_Message.itReadsAnEncryptedMessage(MessageReaderTest.java:53)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:24)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:62)
at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:140)
at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:127)
at org.apache.maven.surefire.Surefire.run(Surefire.java:177)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:345)
at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:1009)

thanks in advance!