ORA-15121: ASM file name 'string' contains

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ORA-15121: ASM filename 'string'contains an invalid diskgroup name
Cause: A file name was specified that did not contain a validdiskgroup name.
The diskgroup name follows immediately after the ASM prefix character. It must
start with an alphabetic character, and consist of up to 30 characters whichare
alphabetic, numeric, or the characters '$' and '_'.
ORA-12700to ORA-19400 13-143
Action: Correctthe file name specification.