When using ]]> you also need to specify a grid size. Eg: ]]> When using 'max' mode you need to specify either width, height or both. For instance: ]]> Dummy Image mode needs both W and H params if original-W and original-H are not passed When using external images, we need the original dims passed or both the desired width and height. Cannot automatically determine original-w or original-h, please pass both explicitly if you are using a non-standard upload field The upload file path doesn't seem valid. It should end with .jpg or .png Width has not been calculated Height has not been calculated