About error「http://linter.structured-data.org/」

When I check on “http://linter.structured-data.org/”, it shows the following errors. Could this be some kind of syntax error? I don’t understand it.

validation https://www.sifactory.net/: Errors found during processing

validation https://www.sifactory.net/: ERROR https://www.sifactory.net/: 100:7: ERROR: Start tag of nonvoid HTML element ends with ‘/>’, use ‘>’. ^ 101:7: ERROR: Start tag of nonvoid HTML element ends with ‘/>’, use ‘>’. ^ 102:7: ERROR: Start tag of nonvoid HTML element ends with ‘/>’, use ‘>’. ^ 103:5: ERROR: End tag ‘’ isn’t allowed here. Currently open tags: html, body, , , , , . ^ 123:1: ERROR: End tag ‘head’ isn’t allowed here. Currently open tags: html, body. ^ 124:1: ERROR: Start tag ‘body’ isn’t allowed here. Currently open tags: html, body. ^