Well, it isn’t really impossible if you focus on everything found in the graphic.
You immediately think that the error will be in the number sequence, but it’s not.
The error is found in the second sentence.
Its impossible is missing an apostrophe. That is needed to show the difference between possession (its) and a the contraction for it is (it’s).
If you found it on your own, good for you! If you didn’t, don’t feel bad. The majority of people don’t.