error when I run the code?

Hi , when I run this code , it shows an error ?

do we have other codes to find a table for the routh hurwitz .

thank you.

[Rafael Hernandez-Walls]

K is different that k?

[fatima hamad]

No ,I change it but still shows an error.

[Andrew Newell]

What is the error message?

[fatima hamad]