Hello, according to the logs, the main app binary is a different version, so kamailio is v5.0.3 and the kex module is v5.0.4. Maybe you also installed kamailio from packages, check to see what is the path to kamailio binary inside /etc/init.d/kamailio. You can also do 'which kamailio' to see where is the first binary found in the execution paths. Cheers, Daniel On 31.10.17 08:34, Abdul Basit wrote: Hi, My kamailio installation with 5.0.3 was working fine. I update kamailio source to 5.0.4 and make all; make install I started receiving error below: /etc/init.d/kamailio start [FAIL] Not starting Kamailio SIP Server: invalid configuration file! ... failed! failed! [....] 0(7426) ERROR: <core> [core/sr_module.c:431]: version_control(): module version mismatch for /usr/local/lib64/kamailio/modules/kex.so; core: kamailio 5.0.3 (x86_64/lin[FAILmodule: kamailio 5.0.4 (x86_64/linux) ... failed! failed! kamailio.cfg is same as earlier. I removed kamailio sources and modules folder /usr/local/lib64/kamailio/ modules/ I also dropped old kamailio postgres database and created new one after fresh source install of version 5.0.4 from git. # git clone https://github.com/kamailio/kamailio kamailio # cd kamailio # git checkout -b 5.0 origin/5.0 But this error persists. Whats the resolution? Is this a bug? -- regards, abdul basit _______________________________________________ Kamailio (SER) - Users Mailing Listsr-users@lists.kamailio.orghttps://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users -- Daniel-Constantin Mierlawww.twitter.com/miconda -- www.linkedin.com/in/miconda Kamailio Advanced Training, Nov 13-15, 2017, in Berlin - www.asipto.com Kamailio World Conference - www.kamailioworld.com