SQL Developer Connect Error - ORA-00604: SQL level 1 ORA-12705: Cannot access NLS data files or invalid environment specified
When using SQL Developer we will sometime get following error if our computer default language is settings don't go well with Oracle SQL Developer. While connecting to database from the SQL Developer fails with the following error: ORA-00604: error occurred at recursive SQL level 1 ORA-12705: Cannot access NLS data files or invalid environment specified How to fix this? Find sqldeveloper.conf file: under SQLDeveloper Home / Bin directory. Edit config file to add below options and save. AddVMOption -Duser.language=en AddVMOption -Duser.country=US Restart SQL Developer and try connection again.