Warning message : Correlation limit(s) violated during Koch Tray Rating calculations

Column Simulation 중에 Tray Rating을 했는데요. Koch Flexitray 를 사용했습니다. 

아래 메세지는 왜 나온걸까요? 해결 방법은?

 

*  WARNING

   CORRELATION LIMIT(S) VIOLATED DURING KOCH TRAY RATING

   CALCULATIONS. EXTRAPOLATION IS USED.

   SET DIAGNOSTICS LEVEL TO 6 TO SEE DETAILS.

 

The message levels for convergence diagnostics are:

Level	Description
0	Only convergence block terminal error messages are listed.
1	Level 0 and convergence block severe error messages are listed.
2	Level 1 and convergence block error messages are listed.
3	Level 2 and convergence block warnings are listed.
4	Level 3 and brief diagnostic information are listed.
5	Level 4 and information on unconverged variables at each iteration are listed.
6	Level 4 and information on every variable at each iteration are listed.
7-8	Level 6 and additional diagnostics for analyzing convergence are listed. This varies for each convergence algorithm.