The present invention relates to a substantially a solid form of 3-(6-(1-(2,2-difluorobenzo[d][1,3]dioxol-5-yl) cyclopropanecarboxamido)-3-methylpyridin-2-yl) benzoic acid (Compound 1, Solvate Form A and Compound 1, HCl Salt Form A), processes for making such forms, pharmaceutical compositions thereof, and methods of treatment therewith.本發明係關於3-(6-(1-(2,2-二氟苯并[d][1,3]二氧雜環戊烯-5-基)環丙烷甲醯胺基)-3-甲基吡啶-2-基)苯甲酸之實質上固體形式(化合物1溶劑合物形式A及化合物1 HCl鹽形式A)、製備此等形式之方法、其醫藥組合物及使用其進行治療之方法。