I have this simple code that it displays a graphic. So, geometry is ok. When I attempt to calculate the area of the graphic (line 5) I get this error. Why? Thanks.
<SPAN class="keyword token">var</SPAN> newbuffer <SPAN class="operator token">=</SPAN> geometryEngine<SPAN class="punctuation token">.</SPAN><SPAN class="token function">difference</SPAN><SPAN class="punctuation token">(</SPAN>buffer<SPAN class="punctuation token">,</SPAN>polygongeom<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
newbuffer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">setSpatialReference</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">SpatialReference</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">{</SPAN> wkid<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">102110</SPAN><SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> buffergraphic <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">esri<SPAN class="punctuation token">.</SPAN>Graphic</SPAN><SPAN class="punctuation token">(</SPAN>newbuffer<SPAN class="punctuation token">,</SPAN> bufferSym<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> thebufferarea<SPAN class="operator token">=</SPAN> geometryEngine<SPAN class="punctuation token">.</SPAN><SPAN class="token function">geodesicArea</SPAN><SPAN class="punctuation token">(</SPAN>geometryEngine<SPAN class="punctuation token">.</SPAN><SPAN class="token function">simplify</SPAN><SPAN class="punctuation token">(</SPAN>buffergraphic<SPAN class="punctuation token">.</SPAN>geometry<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'acres'</SPAN><SPAN class="punctuation
