ORA-00218: block size string of control file ' string ' does not match DB_BL...

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ORA-00218: block size string  of control file ' string ' does not match DB_BLOCKSIZE ( string )
Cause:  The block size as stored in the control file header is different from the value of the initialization parameter DB_BLOCK_SIZE. This might be due to an
incorrect setting of DB_BLOCK_SIZE, or el se might indicate that the control file has either been corrupted or belongs to a different database.
Action:   Restore a good copy of the control file . If the control file is known to be clean set the DB_BLOCK_SIZE to match control file headers block size value.