Rosander

MEMORANDUM ****

Curt Rosander appeals the district court’s decision affirming the final decision of the Commissioner of Social Security (“Commissioner”), in which the Commis *547 sioner affirmed the decision of an Administrative Law Judge (“ALJ”), who found that Rosander was not disabled within the meaning of the Social Security Act and therefore was not eligible for benefits. We affirm the decision of the district court.

We review the district court’s judgment de novo, and we “set aside a denial of benefits only if it is not supported by substantial evidence or is based on legal error.” Lingenfelter v. Astrue, 504 F.3d 1028, 1035 (9th Cir.2007) (citations and internal quotation marks omitted). “A decision of the ALJ will not be reversed for errors that are harmless.” Burch v. Barnhart, 400 F.3d 676, 679 (9th Cir.2005).

Rosander contends that the ALJ erred in failing to consider Rosander’s mental impairment in determining whether Rosander was disabled. He also argues that substantial evidence does not support the ALJ’s finding that Rosander’s mental impairment was not severe.

A claimant has the burden of proving the existence and severity of alleged impairments during the time…