I installed boinc on centOS virtualbox on ubuntu laptop
and installed default boinc client on ubuntu itself.
I tried to add client, I get an error.
[error] no start tag in scheduler reply

Please help me out.

Which project is this on?
Can you post all of your start-up messages, please?

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Server Info:
Linux localhost.localdomain 2.6.18-164.el5 #1 SMP Thu Sep 3 03:33:56 EDT 2009 i686 i686 i386 GNU/Linux
running on Sun Virtualbox 2.2.4 r47978 on ubuntu 9.04

#cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 Duo CPU T5450 @ 1.66GHz
stepping : 13
cpu MHz : 1719.961
cache size : 2048 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 constant_tsc up pni monitor
bogomips : 3439.92

BOINC Manager Messages

Fri 25 Sep 2009 10:57:53 AM PDT||Starting BOINC client version 6.2.18 for i686-pc-linux-gnu
Fri 25 Sep 2009 10:57:53 AM PDT||log flags: task, file_xfer, sched_ops
Fri 25 Sep 2009 10:57:53 AM PDT||Libraries: libcurl/7.18.2 OpenSSL/0.9.8g zlib/1.2.3.3 libidn/1.10
Fri 25 Sep 2009 10:57:53 AM PDT||Data directory: /var/lib/boinc-client
Fri 25 Sep 2009 10:57:54 AM PDT||Processor: 2 GenuineIntel Intel(R) Core(TM)2 Duo CPU T5450 @ 1.66GHz [Family 6 Model 15 Stepping 13]
Fri 25 Sep 2009 10:57:54 AM PDT||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 nx lm constant_tsc arch_perfmon pebs bts pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm lahf_lm
Fri 25 Sep 2009 10:57:54 AM PDT||OS: Linux: 2.6.28-15-generic
Fri 25 Sep 2009 10:57:54 AM PDT||Memory: 1.96 GB physical, 1.91 GB virtual
Fri 25 Sep 2009 10:57:54 AM PDT||Disk: 27.50 GB total, 8.70 GB free
Fri 25 Sep 2009 10:57:54 AM PDT||Local time is UTC -7 hours
Fri 25 Sep 2009 10:57:54 AM PDT||No coprocessors
Fri 25 Sep 2009 10:57:54 AM PDT|Test1@home|URL: http://192.168.0.189/test1/; Computer ID: not assigned yet; location: (none); project prefs: default
Fri 25 Sep 2009 10:57:54 AM PDT||No general preferences found - using BOINC defaults
Fri 25 Sep 2009 10:57:54 AM PDT||Reading preferences override file
Fri 25 Sep 2009 10:57:54 AM PDT||Preferences limit memory usage when active to 1002.29MB
Fri 25 Sep 2009 10:57:54 AM PDT||Preferences limit memory usage when idle to 1804.12MB
Fri 25 Sep 2009 10:57:54 AM PDT||Preferences limit disk usage to 8.61GB
Fri 25 Sep 2009 10:57:54 AM PDT|Test1@home|Fetching scheduler list
Fri 25 Sep 2009 03:25:47 PM PDT|Test1@home|Resetting project
Fri 25 Sep 2009 03:25:47 PM PDT|Test1@home|Detaching from project
Fri 25 Sep 2009 03:26:08 PM PDT||Fetching configuration file from http://192.168.0.189/test/get_project_config.php
Fri 25 Sep 2009 03:26:30 PM PDT|Test|Master file download succeeded
Fri 25 Sep 2009 03:26:35 PM PDT|Test|Sending scheduler request: Project initialization. Requesting 1 seconds of work, reporting 0 completed tasks
Fri 25 Sep 2009 03:26:36 PM PDT||A new version of BOINC (6.6.40) is available for your computer
Fri 25 Sep 2009 03:26:36 PM PDT||Visit http://boinc.berkeley.edu/download.php to get it.
Fri 25 Sep 2009 03:26:40 PM PDT|Test|[error] No start tag in scheduler reply
Fri 25 Sep 2009 03:27:40 PM PDT|Test|Sending scheduler request: Project initialization. Requesting 1 seconds of work, reporting 0 completed tasks
Fri 25 Sep 2009 03:27:45 PM PDT|Test|[error] No start tag in scheduler reply
Fri 25 Sep 2009 03:28:46 PM PDT|Test|Sending scheduler request: Project initialization. Requesting 1 seconds of work, reporting 0 completed tasks
Fri 25 Sep 2009 03:28:51 PM PDT|Test|[error] No start tag in scheduler reply
Fri 25 Sep 2009 03:29:51 PM PDT|Test|Sending scheduler request: Project initialization. Requesting 1 seconds of work, reporting 0 completed tasks
Fri 25 Sep 2009 03:29:56 PM PDT|Test|[error] No start tag in scheduler reply
Fri 25 Sep 2009 03:30:56 PM PDT|Test|Sending scheduler request: Project initialization. Requesting 1 seconds of work, reporting 0 completed tasks
Fri 25 Sep 2009 03:31:01 PM PDT|Test|[error] No start tag in scheduler reply
Fri 25 Sep 2009 03:32:11 PM PDT|Test|Sending scheduler request: Project initialization. Requesting 1 seconds of work, reporting 0 completed tasks
Fri 25 Sep 2009 03:32:17 PM PDT|Test|[error] No start tag in scheduler reply
Fri 25 Sep 2009 03:37:52 PM PDT|Test|Sending scheduler request: Project initialization. Requesting 1 seconds of work, reporting 0 completed tasks
Fri 25 Sep 2009 03:37:58 PM PDT|Test|[error] No start tag in scheduler reply
Fri 25 Sep 2009 03:56:16 PM PDT|Test|Sending scheduler request: Project initialization. Requesting 1 seconds of work, reporting 0 completed tasks
Fri 25 Sep 2009 03:56:21 PM PDT|Test|[error] No start tag in scheduler reply
Fri 25 Sep 2009 04:01:07 PM PDT|Test|Sending scheduler request: Requested by user. Requesting 30240 seconds of work, reporting 0 completed tasks
Fri 25 Sep 2009 04:01:12 PM PDT|Test|[error] No start tag in scheduler reply

Is this your own project?
Are this two separate computers, or is it all running from one computer?
Was there a question? ;-)

Probably how to get rid of the message about the start tag being missing in the scheduler reply.

Could you please add some debug flags in cc_config.xml, preferably <sched_op_debug> and <http_debug> and restart BOINC, then post another log?

The message means as much as this: you sent a message to the scheduler, it replied, but the received message was either empty, or not completely sent. So it cannot be used by BOINC.

Can you also post the actual contents of your sched_reply*.xml file, please? If you do not want the URL of the project to be known to the public, blank out the <master_url> entry in the file, as well as any <url>'s in the <file_info> sections.

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That looks like a server problem. Look at scheduler.log in your project server installation.

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