My epub failed the Apple validation check via ebookflightdeck

I am looking for somebody who can help me with the three epub failure comments below. Any hints? Many Thanks

This EPUB failed validation using Transporter, Apple's official validation tool.

/tmp/_flightdeck_sekn1z/DC_2019_E_2_1567694700813.itmsp/DC_2019_E_2.1567694700813.epub/DC_2019_E_2.1567694700813.epub(-1): [OPF-029] The file 'OEBPS/image/1.jpg' does not appear to match the media type image/jpeg, as specified in the OPF file. (For more information refer to http://support.apple.com/kb/HT6213)

/tmp/_flightdeck_sekn1z/DC_2019_E_2_1567694700813.itmsp/DC_2019_E_2.1567694700813.epub/OEBPS/DC_2019_E-53.xhtml(31): [RSC-005] Error while parsing file 'value of attribute "src" is invalid; must be a URI'. (For more information refer to http://support.apple.com/kb/HT6213)