Trying to display subsidiary address (works) and Logo (fails) on Invoice form

I am modifying the Invoice Advanced HTML so that I can print the subsidiary address and use the proper logo specified on the subsidiary.

For the address I changed ${companyinformation.addresstext} to ${subsidiary.mainaddress_text}) and that worked perfectly
BUT
I changed ${companyInformation.logourl} to ${subsidiary.logo} and get an error message

The value of attribute "src" associated with an element type "img" must not contain the '<' character.
[LIST]
[*]org.xml.sax.SAXParseException; lineNumber: 7; columnNumber: 40; The value of attribute "src" associated with an element type "img" must not contain the '<' character.
[/LIST]
My images do not have the < character and all are available for use without login.