Unanticipated error : "ORA-06502: PL/SQL: numeric or value error: character string buffer too sma (4286794)

When attempting to add a new test case by clicking on the 'Click to create a New Test...' button, when choosing a particular package,the following error occurs:

"Error code: 10000002
 Error name: UNANTICIPATED-ERROR
 Error details: 

 Unexpected failure when initializing test definition from program definition. 
 An unanticipated error has occurred. Please review the information below and see if it will help you resolve the problem. 
 ORACLE_ERROR = ORA-06502: PL/SQL: numeric or value error: character string buffer too small

 Error stack: 

 ORA-06512: at "CODE_TESTER.QU_DESCRIBE", line 201
 ORA-06512: at "CODE_TESTER.QU_UNIT_TEST_XP", line 1446
 ORA-06512: at "CODE_TESTER.QU_UNIT_TEST_XP", line 1666
 ORA-06512: at "CODE_TESTER.QU_UNIT_TEST_XP", line 1820
 ORA-06512: at "CODE_TESTER.QU_HARNESS_XP", line 1400"