Help! I'm making Mrs Larkin's Christmas Pumpkin bread, and the only wet ingredients are 1/3 cup oil and 1 cup pumpkin puree, for 1 2/3 cup flour, plus 1 1/3 cup sugar. My mixture has come out very dry and crumbly. Has anyone else made this - is there something I've missed? Should I add extra oil or water or eggs? Thank you!