Final answer:
The mistake in the sentence is the phrase 'at two weeks' time.' The correct version would be 'in two weeks' time.'
Step-by-step explanation:
The mistake in the sentence is the phrase 'at two weeks' time.' The correct version would be 'in two weeks' time.'
In the original sentence, 'at' is used incorrectly instead of 'in'. The correct preposition to use when indicating a future point in time is 'in'.
For example, 'I'll see you in two weeks' time' is the correct way to express meeting someone in the future.