oracle error - ORA-00212: block size string below minimum required size of string bytes

ORA-00212:	block size string below minimum required size of string bytes
Cause:	The block size specified was too small. Space for the system overhead is required.
Action:	Specify a larger block size and retry the operation.

oracle error - ORA-00211: control file does not match previous control files

ORA-00211:	control file does not match previous control files
Cause:	A control file was specified that belongs to another database.
Action:	Find and install the correct control file.

ORA-00210:	cannot open the specified control file
Cause:	Cannot open the control file.
Action:	Check to make sure the control file exists and is not locked by some other program.