REP-0004: Warning: Unable to open user preference file

Dear Sir,

I have been facing this error whenever i try to generate the report for service request it throwing a warning that 'REP-0004: warning : unable to open user preference file' below are the details of log file.

| Starting concurrent program execution...
+-----------------------------

Arguments
------------
P_DATE_TO='2023/01/01 00:00:00'
------------

Forcing NLS_NUMERIC_CHARACTERS to: '.,' for XDO processing

 APPLLCSP Environment Variable set to :

 Current NLS_LANG, NLS_NUMERIC_CHARACTERS and NLS_SORT Environment Variables are :
American_America.AL32UTF8

'.,'

BINARY

Enter Password: 
REP-0004: Warning: Unable to open user preference file.

Report Builder: Release 10.1.2.3.0 - Production on Wed Dec 27 11:50:14 2023