Invalid expression error when i execute code

Can anyone tell whats the problem with this code

Answer 1

[Alex Mcaulley]

You can't use numbers as a variable names.

Valid variable and function names begin with an alphabetic character, and can contain letters, numbers, or underscores.

You must write:

function j3012 = RCPSP(var1,var2,var3)

Answer 2

[Wilmer Buitrago Duarte]

How did you program the sequence in series?