I'm receiving an error when using cmis(n) for twoway line in Stata 16. I'm working with this toy example to try to identify the cause of the error. No problems when running twoway line without the cmis(n) option.

HTML Code:
 tab x y, m

           |                y
           x |  14.83      20.99       . |     Total
-----------+---------------------------------+----------
        12 |         0          1          0 |         1
        13 |         0          1          0 |         1
        14 |         0          0          1 |         1
        15 |         1          0          0 |         1
        16 |         1          0          0 |         1
        17 |         1          0          0 |         1
-----------+---------------------------------+----------
     Total |         3          2          1 |         6

. twoway line y x

. twoway line y x, cmis(no)
option cmis() not allowed
r(198);