The following sentence has been split into four segments. Identify the segment that contains a grammatical error.
In addition with / the existing crisis in economy, / the rise of hunger index / is another cause of worry.

The segment containing an error is "In addition with".
Correct phrase: "In addition to"
Explanation:
· The correct preposition after "In addition" is "to", not "with".
· "In addition to" is used to add information.
Grammatical rule used:
· "In addition to" is the correct idiomatic phrase meaning "besides" or "as well as".
· "With" is incorrect because it does not fit this phrase.
Example:
· Incorrect: In addition with his job, he runs a business.
· Correct: In addition to his job, he runs a business.
Meanings of other segments:
· "the rise of hunger index" (correct).
· "the existing crisis in economy" (correct).
· "is another cause of worry." (correct).