[Proj] ERROR 6: No translation for Lambert ConformalConic to PROJ.4 format is known.

[Clifford J Mugnier]

Actually, American Samoa has a single standard parallel; it is a true Tangent Case of the Lambert Conformal Conic.  
 
On the other hand, the British Definition only lists the Latitude of Origin along with the Scale Factor at Origin.  For the British Definition, there's only "one standard parallel" according to the ignorant programmers that can't spell Geodesy with their eyes closed, but the two standard parallel case in the British Definition also lists the Scale Factor at Origin as being less than one (0.9999xxxxxxx).  
 
For American Samoa, in the British Definition, the Scale Factor at Origin is equal to unity (1.0).