oracle.apps.fnd.framework.OAException: Illegal method call because there is no database connection

When attempting to login to EBS R12, the following error occurs: oracle.apps.fnd.framework.OAException: Illegal method call because there is no database connection Error while invoking Main Menu. java.io.FileNotFoundException: /app/oracle/EBSTEST/apps/inst/apps/EBSTEST_bkptapsrv2/appl/fnd/12.0.0/secure/EBSTEST.dbc (Too many open files) Stop application services $ adstpall.sh apps/apps Delete states and persistence files rm $ORA_CONFIG_HOME/10.1.3/opmn/logs/states/* rm -fr $INST_TOP/ora/10.1.3/j2ee/oacore/persistence/* rm -fr $INST_TOP/ora/10.1.3/j2ee/oafm/persistence/* rm -fr $INST_TOP/ora/10.1.3/j2ee/forms/persistence/* Restart services and try