Drop doesn't work

Hi,
that's my problem:
Connected as system I want to drop a user 'User1' by sql command:
drop user User1 cascade;
I get the message: ORA-01918: user name does not exist
But "select * from all_users" shows User1 with USER_ID = 118 !
Deleting the user by APEX-GUI thru Home>Administration>Manage Database Users>User --> Drop
works fine!
My long-shot guess is that User1 was generated by "Datapump" .
Can anybody help?
Regards,
Wilfried

My short shot guess the user was created with mixed case and wrapped in double quotes so Oracle took the username literally.
Lowercase characters (and the - and the space character) are considered special characters in identifiers. If you are using special characters you need to wrap this identifier thus:
"DitIsEenVervelende Gebruiker"
I see you seem to follow the course
'How can I work with Oracle by reading as little as possible'.
You will need to end that course very soon, or you'll become a true bore to this forum.
Sybrand Bakker
Senior Oracle DBA

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