The grammatically incorrect sentence is:
"She has seen the movie last night."
The correct version should be: "She saw the movie last night." Since "last night" refers to a specific time in the past, the simple past tense "saw" should be used instead of the present perfect "has seen."
Additionally, the phrase "considering to launch" in "The company is considering to launch a new product next year." could also be revised for clarity to "considering launching," but it's not outright incorrect in the same way as the first sentence.