Explanation:

- I was thrilled: This segment is grammatically correct. "I was thrilled" is a common way to express excitement or pleasure.

- with my friend: This portion is also correct. It correctly indicates that the action is being done with a friend.

- to going out: This segment contains the grammatical error. The correct form should be "thrilled to go out" instead of "thrilled to going out." The verb following "to" should be in its base form.

- for the film: This phrase is grammatically correct. It specifies the purpose of the outing.

Option:2- to going out is the correct answer.