I started receiving this error last week and cannot find the reasoning behind it.
Organization: AFCEA User: email@example.com
Salesforce reported the below errors as NPSP was attempting to execute its batch jobs, or at a time when it was unable to display error messages directly to a user. It’s likely that NPSP was attempting to update summary fields on Accounts and Contacts, but was unable to save certain records. This failure might have been caused by a variety of issues unrelated to NPSP, such as custom code or validation rules.
Read this article on the Power of Us Hub to learn how these Scheduled Jobs work: https://powerofus.force.com/NPSP_Scheduled_Jobs
Error Type: Batch Apex error Error Date: 2017-07-04 06:00:39 Message: "First error: Update failed. First exception on row 0 with id 0014100000Zs4XHAAZ; first error: CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY, AFCEAAccountCallout: execution of AfterUpdate
caused by: System.AsyncException: Future method cannot be called from a f..." Context: npsp__RLLP_OppAccRollup_BATCH
Stack Trace: null