ORA Database Error Messages ORA-13291: conversion error between the specified unit and standard unit August 13, 2015 mpbod ORA-13291: conversion error between the specified unit and standard unit Cause: Cannot convert the specified unit from/to standard unit for linear distance, angle, or area. Action: Check the unit specification and respecify it. Back to previous menu Share this:Click to email a link to a friend (Opens in new window)Click to print (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Pocket (Opens in new window)