Improper tendon property, - Incorrect number of assigned elements, curve type and reference axis selection - Make sure to input coordinates based on reference axis selected, whether based on element local axis or on global axis system or along a specified curve. Also, confirm the type of bonding of tendon with the duct. Duct diameters to be of adequate size for tendon area - Consideration of relaxation, entries for friction as well as wobble coefficients and the slip. Improper definition of tendon property, tendon profile: The common mistakes in this dialogue box are: -Assigning inappropriate tendon material, improper tendon type. Prestressing force applied at one end or both ends 1. Consideration of time dependent properties of concrete 5. Consideration of transformed concrete section 4. Internal consideration of the software for pre-stress calculation 3. Improper definition of tendon property or tendon profile 2.