This error appear On Sql developer .
ORA-00604: error occurred at recursive SQL level 1
ORA-12705: Cannot access NLS data files or invalid environment specified
Solution :
Try to add following lines to %SQL_DEV_HOME%\sqldeveloper\bin\sqldeveloper.conf
AddVMOption -Duser.language=en
AddVMOption -Duser.country=USus depend on your language .
en : England and so on ….
Thank you
Osama Mustafa
Technology Geek 