1 Start SQLPLUS:
sqlplus “/as sysdba”
2 Check whether tablespaces are set READ ONLY (now the database is in OPEN state):
SELECT TABLESPACE_NAME FROM DBA_TABLESPACES WHERE STATUS = ‘READ ONLY’;
3 If tablespaces are returned, reset them to ONLINE:
ALTER TABLESPACE <Tablespace_Name> READ WRITE;
4 If the call in step 2 does not return lines anymore, the problem is corrected.
This error from Oracle means the database is be set to read-only
Make sure the UIM tables are read/write.