This error occurs when:
- The number of pages is not multiple of 4 and you are trying to create a brochure with saddle-stitched binding
- There is no spine area provided between the front and the back cover spread and you are trying to create a brochure with perfect binding
Solution:
- For saddle-stitched brochures, ensure that the total number of pages is multiple of 4
- For perfect binding brochures, prepare the spine according to our guidelines