What is the test for overturning a finding of error in an evidentiary ruling?

We have jurisdiction pursuant to 28 U.S.C. 1291. We review evidentiary rulings for abuse of discretion and reverse only if a ruling is "erroneous and prejudicial." Wagner v. Cty. of Maricopa , 747 F.3d 1048, 1052 (9th Cir. 2013) (emphasis added). "When error is established, we must presume prejudice unless it is more probable than not that the error did not materially affect the verdict." Boyd v. City & Cty. of San Francisco , 576 F.3d 938, 949 (9th Cir. 2009) (internal quotations and citations omitted).