Percept Internal Error

[{percept2_html,process_gen_graph_img_result,2, [{file,"src/percept2_html.erl"},{line,1577}]}, {percept2_html,load_sample_data_page,3, [{file,"src/percept2_html.erl"},{line,2236}]}, {mod_esi,'-erl_scheme_webpage_chunk/5-fun-0-',5, [{file,"mod_esi.erl"},{line,368}]}]