Optimization target function as 44 other functions summed

[lalaala]

Hello, I have an assignment where I have to optimize a sum of 44 functions, here is my code:

proc optmodel;
var x{1..2};
con .49*x[2] -x[1]*x[2] -0.9 >= 0;
con .4 <=x[1];
con .4 <= x[2];
min f = put(sum {i in 1..44} ((2+i) - x[1]- (.49 -x[1])*exp(-x[2]*(8/i-8)))**2);
solve;
print x[1] x[2];
run;

I keep getting this error:

[lalaala]

I've solved it, put wasn't necessary.

[ballardw]

For future posts it helps to post the code and error messages copied from the log. The entire data step or proc step and all of the messages. Copy from the LOG and paste into a code box as you did for the code.

Often there are diagnostic characters in the log to indicate where the error was triggered.

In this case I would suspect an underscore character appeared under the PUT of the offending line.