Oracle Error Message
ORA-25157: Specified block size string is not valid
Reason for the Error
An attempt was made to create a tablespace with a block size which is not supported.
Solution
Specify one of the valid blocksizes i.e the standard blocksize or one of (2k, 4k, 8k, 16k, 32k) subject to the maximum and minimum blocksizes supported by the platform.