(Run Report Generation Scheduled Tasks) failed in CRON run

Any one please help me to resolve the report generation scheduled tasks failed.
While running scheduler given below error is keep on coming in error log.

Can you figure out which Scheduled Report is causing problems? Go in the Scheduled Reports list view and try disabling a few.

Hi pgr,
While clicking scheduler report listing page, page it self not opening. Totally 7 records are available but showing only one record after that it’s listing page breaking. I am editing directly from report detail page.

    Don't know why this type of error is coming. Help me to resolve this issue.

Well, so now you have a new symptom, you can check your logs (both of them!) at the moment when the page breaks.