Unknown projection string

Hello, Dear James
I try to deploy the Arctic Web Map using your instruction and I successfuly installed sofware, imported the data into postgresql, but it seems doesn't work because of the error "osm renderd[198159]: Unknown projection string, using web mercator as never the less. +proj=laea +lat_0=90 +lon_0=-100 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs".
Could you help me please?