I made a directory 'boinc_test' under project directory and try to run boinc_client but got message below:

kchen3@lobo:/chen/project/boinc_test/boinc_test$ boinc_client
2008-06-12 16:17:06 [---] Starting BOINC client version 5.10.8 for i686-pc-linux-gnu
2008-06-12 16:17:06 [---] log flags: task, file_xfer, sched_ops
2008-06-12 16:17:06 [---] Libraries: libcurl/7.16.4 OpenSSL/0.9.8e zlib/1.2.3.3 libidn/1.0
2008-06-12 16:17:06 [---] Data directory: /chen/project/boinc_test/boinc_test
2008-06-12 16:17:06 [---] Processor: 4 GenuineIntel Intel(R) Xeon(TM) CPU 2.80GHz [Family 15 Model 2 Stepping 7]
2008-06-12 16:17:06 [---] Processor features: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid
2008-06-12 16:17:06 [---] Memory: 503.59 MB physical, 1.43 GB virtual
2008-06-12 16:17:06 [---] Disk: 31.97 GB total, 28.52 GB free
2008-06-12 16:17:06 [---] No general preferences found - using BOINC defaults
2008-06-12 16:17:06 [---] Preferences limit memory usage when active to 251.79MB
2008-06-12 16:17:06 [---] Preferences limit memory usage when idle to 453.23MB
2008-06-12 16:17:06 [---] Preferences limit disk usage to 9.31GB

2008-06-12 16:17:35 [---] [error] GUI RPC bind failed: 98
gstate.init() failed: -180
kchen3@lobo:/chen/project/boinc_test/boinc_test$

I found a same problem here http://setiweb.ssl.berkeley.edu/sah/forum_thread.php?id=36336

because of a boinc version 4. I am using boinc version 5, really don't know what is happening. Appreciate any idea from you. Thanks.

I made a directory 'boinc_test'
...
2008-06-12 16:17:35 [---] [error] GUI RPC bind failed: 98
gstate.init() failed: -180
...

It is a socket error, hardly a directory problem.

Error 98 is something like "socket already used" - did you try to run two concurrent BOINCs ?

Check your process list for stuck BOINC related tasks from earlier sessions.