Final answer:
The sentence that contains a comma error is 'The packages became too heavy for me, I dropped them.' The error in this sentence is the missing comma after 'me.' The corrected sentence is 'The packages became too heavy for me, and I dropped them.'
Step-by-step explanation:
The sentence that contains a comma error is: The packages became too heavy for me, I dropped them.
The error in this sentence is that there should be a comma after the word 'me' to separate the two independent clauses 'The packages became too heavy for me' and 'I dropped them.'
Corrected sentence: The packages became too heavy for me, and I dropped them.