Check opatch log file:
The log files are located in the <ORACLE_HOME>/cfgtoollogs/opatch directory. Each log file is tagged with the timestamp of the operation. Log files are named as opatch_<date mm-dd-yyyy>_<time hh-mm-ss>.log.
Please read "Problem Resolution" in Oracle® Universal Installer and OPatch User's Guide http://docs.oracle.com/cd/E11882_01/em.112/e12255/oui7_opatch.htm#g1292661.