What is the test for determining whether a jury has been instructed there must be proof of at least one of the seven acts alleged in the information?

Here, the jury was essentially instructed there must be proof of the commission of at least one of the seven overt acts alleged in the information, two of which we have held to be invalid. Because the finding of at least one overt act is a necessary element of proof ( 182, sub. (b), 184; People v. Morante, supra, 20 Cal.4th at p. 416), we review the entire record to determine whether it appears beyond a reasonable doubt the legal error complained of did not contribute to the verdict. (People v. Harris, supra, 9 Cal.4th at p. 424.)