Running describeReport(3-arg); of Salesforce Reports and Dashboard API, gives an error(in the SS). Any idea why could this be happening?

Question

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Edit for better error message and methods googleability:

Exception occurred - The data you're trying to access is unavailable.

Class.reports.ReportManager.describeReport: line 6, column 1
Class.SaveInvoiceAsCSVFile.saveInvoice: line 44, column 1
Class.PemeWsJobs.execute: line 19, column 1

The data you're trying to access is unavailable.

System.NoDataFoundException

Please consider following before answering:

• The same code runs when invoked through anonymous code window in devConsole.
• "Run reports" permission is there on profile running this code.
• If I query the records with fields that the report is on, they show up no error.

Answer 1

Got the answer, the problem was that the user did not have access in the Folder that contained the report being used in Reports.ReportManager.describeReport(3-argument) call.