Oracle Message ORA-25157 - Specified block size string is not valid

ERRORSpecified block size string is not valid
CAUSEAn attempt was made to create a tablespace with a block size which is not supported.
ACTIONSpecify 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.