Can't install my addon from addons.mozilla.org

Can’t install my addon from addons.mozilla.org .
https://addons.mozilla.org/en-US/firefox/addon/ac-unit-test/

This addon is already Status:Fully Reviewed and Visibility:Listed.
However, when I click the Add to firefox button, the following message is displayed.
“Firefox has prevented this site from installing an unverified add-on”

Browser console say…

1450459640312 addons.xpi WARN Download of https://addons.mozilla.org/firefox/downloads/latest/662336/addon-662336-latest.xpi?src=category failed: signature is required but missing

But, Add-on sigined in Firefox say…

All add-ons hosted on addons.mozilla.org undergo this process in order to be signed.

How can I solve them?

You were reusing an already reviewed version number, which breaks your file. Please increase the version number and reupload a new version.

Thank you for the advice.
I will try to re-upload.