I HAVE INSTALLED ORACLE DEVELOPER SUITE, AND TRYING TO CONNECT TO MY DATABASE THROUGH ORACLE FORM / AND REPORT BUILDER BOTH OF THEM !! BUT EVERYTIME I GET ERROR:
REP-501 UNABLE TO CONNECT TO SPECIFIED DATABASE
ORA-12154 TNS:COULD NOT RESOLVE THE CONNECT IDENTIFIER SPECIFIED,

NOTE MY DATABASE IS UP AND RUNNING AND IM ABLE TO CONNECT TO IT THROUGH SQL*PLUS,
BOTH THE DATABASE AND DEVELOPER SUITE ARE INSTALLED ON THE SAME MACHINE,