Hi There,
Please could you show the full text in the left hand panel for us? I think using this instead should work:
nCorr = sum(study.data['totalacertos'])
meanRT = average(study.data['key_resp_2.rt')
msg = 'Voce acertou' + str(nCorr) + 'operacoes de 192....' + str(meanRT)
In general, plus concatenation is smoother to translate to JS over formatted strings. and using the methods sum and average in this new way translate smoother than calling the method on the object as you have done (and as would be normal in python)
Hope this helps,
Becca