FishEye fails to scan SVN repository with native client 1.5.4

I'm just testing the FishEye 2.0.4 against one local subversion server via the http protocol

It works well with the embedded SVN client, but when I switch to native subversion client the following errors appear:

ERROR [InitialPinger1] fisheye.app RepositoryScanner-slurp - Problem processing revisions from repo http://svn.local.net/svn/work/ due to class com.cenqua.fisheye.rep.RepositoryClientException - org.tigris.subversion.javahl.ClientException: RA layer request failed
svn: REPORT of '/svn/work/!svn/bc/1025': 200 OK (http://svn.local.net)

com.cenqua.fisheye.rep.RepositoryClientException: org.tigris.subversion.javahl.ClientException: RA layer request failed
svn: REPORT of '/svn/work/!svn/bc/1025': 200 OK (http://svn.local.net)

at com.cenqua.fisheye.svn.SvnThrottledClient.logMessages(SvnThrottledClient.java:130)
at com.cenqua.fisheye.svn.SvnRepositoryScanner.getRevList(SvnRepositoryScanner.java:140)
at com.cenqua.fisheye.rep.RepositoryScanner.updateRevList(RepositoryScanner.java:532)
at com.cenqua.fisheye.rep.RepositoryScanner.processRevisions(RepositoryScanner.java:379)
at com.cenqua.fisheye.rep.RepositoryScanner.slurpRepository(RepositoryScanner.java:266)
at com.cenqua.fisheye.rep.RepositoryScanner.slurp(RepositoryScanner.java:186)
at com.cenqua.fisheye.rep.RepositoryScanner.ping(RepositoryScanner.java:119)
at com.cenqua.fisheye.svn.SvnRepositoryEngine.doSlurp(SvnRepositoryEngine.java:68)
at com.cenqua.fisheye.rep.ping.OneOffPingRequest.doRequest(OneOffPingRequest.java:30)
at com.cenqua.fisheye.rep.ping.PingRequest.process(PingRequest.java:90)
at com.cenqua.fisheye.rep.RepositoryHandle.processPingRequests(RepositoryHandle.java:120)
at com.cenqua.fisheye.rep.RepositoryHandle.queuePingRequest(RepositoryHandle.java:110)
at com.cenqua.fisheye.rep.ping.PingRequest.run(PingRequest.java:57)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Caused by: org.tigris.subversion.javahl.ClientException: RA layer request failed
svn: REPORT of '/svn/work/!svn/bc/1025': 200 OK (http://svn.local.net)

at org.tigris.subversion.javahl.SVNClient.logMessages(Native Method)
at com.cenqua.fisheye.svn.SvnThrottledClient.logMessages(SvnThrottledClient.java:128)
... 15 more

Running on Ubuntu 9.04 Linux/x86 with subversion and libsvn-java version 1.5.4dfsg1-1ubuntu2.1 packages installed
Setup applied to switch to native client:
Native lib: /usr/lib/jni/libsvnjavahl-1.so
Jar lib: /usr/share/java/svn-javahl.jar