sitemap giving warnings in google

Hi,
I have support access on for aficreditsolutions.com. Smartcrawl is running on the site.
I'm getting this error message when submitting sitemap to google.

Warnings
Url blocked by robots.txt.
Sitemap contains urls which are blocked by robots.txt.
3
Value: http://www.agelafinancialinc.com/images/graphics/how_stack2.jpg
-
Aug 5, 2018
Value: http://www.agelafinancialinc.com/images/graphics/pdf_bar.jpg
-
Aug 5, 2018
Value: http://www.agelafinancialinc.com/images/graphics/poor_credit.jpg
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Aug 5, 2018