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LDAP_PARAM_ERROR sometimes under multithread environment

Hi,

I have an application which needs to add entries to LDAP.If I use single thread,then everything is OK.But if I use multithread to access LDAP,it will popup error "LDAP_PARAM_ERROR" sometimes.
For example,I have entris "c=CN","o=SSTech,c=CN","ou=Develop,o=SSTech,c=CN" in my ldap server already.Everytime, I add entries such as "cn=a,ou=Develop,o=SSTech,c=CN","cn=b,ou=Develop,o=SSTech,c=CN" to ldap.If I use multithread to do that,sometimes I get such logs from my application as below:
...
search [ou=Develop,o=SSTech,c=CN] failed,error=89;
search [o=SSTech,c=CN] failed,error=89;
search [c=CN] failed,error=89;
... 

Who can tell me how this happen? Why multithread operation cause such problem? And how to solve it?

Any hints or suggestions will be appreciated.

Thanks in advance.

Best Regards 
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