-xt_size.parse error: 'Invalid format of size: '1X'.'.
-xt_size.parse error: 'Invalid value of size: 'KB'.'.
-xt_size.parse error: 'Invalid value of size: ''.'.
+xt_size.parse error: 'Invalid units: '1X'.'.
+xt_size.parse error: 'Invalid value of size: 'KB'; number parser error: Number contains no digits.'.
+xt_size.parse error: 'Invalid value of size: 'X1KB'; number parser error: Number contains no digits.'.
+xt_size.parse error: 'Invalid units: '1XKB'.'.
+xt_size.parse error: 'Invalid units: '1KBX'.'.
+xt_size.parse error: 'Invalid value of size: ''; number parser error: Number contains no digits.'.