Error Code: ERROR ITMS-3000: "Line 79 column 29: element "data_file" incomplete; missing required element "checksum""
I have created an ebook in Jutoh {this is probably about the 120th book I've made} and am trying to upload in iTunes Producer. It validates properly but then I receive the error code mentioned above, ERROR ITMS-3000: "Line 79 column 29: element "data_file" incomplete; missing required element "checksum"" and I have NO IDEA what this means! Does anybody have an idea of how/what I need to do to fix this? Thank you in advance.