This sentence is a double negative. It would be like saying "I don't hear nothing" in English. Are these commonplace in Portuguese or is this an error?
No, its totally common in Portuguese. Ex"não comi nada hoje"... we say this way....
So in French, and in Hebrew as well
for Brazilian who learn English is kinda hard to defferenciate that, cause we like negative sentences :)
"- Did you hear anything?" (Você ouviu alguma coisa?")
"- I didn't hear anything!.." (Não ouvi nada!")
I was not able to hear anything.