Sometime you will get this error "svn: OPTIONS of '': Server certificate verification failed: issuer is not trusted (" when setting svn (source control) on Coda.

The solution is so easy to solve.

Open your terminal -> type " svn list yourservername", e.g. " svn list", then will show that notification

Certificate information:
 - Hostname:
 - Valid: from Tue, 28 Jun 2011 02:36:55 GMT until Wed, 27 Jun 2012 02:36:55 GMT
 - Issuer: Taipei, Taiwan, TW, RD, ???
 - Fingerprint: XXX(ignore that)
(R)eject, accept (t)emporarily or accept (p)ermanently? p
choose 'p' to authenticate this certificate on your computer permanently.
Back to your coda reconnect successfully.