Query failed: ERROR: Operation on two geometries with different SRID

I had to change the srid of the column from the UNKNOWN indicator of -1 to 4326. The answer at this StackOverflow post was very helpful in this. Also, the question in this SE GIS post was instrumental in helping me in the right direction.

Summarily: Running UPDATE table_name SET the_geom = ST_SetSRID(the_geom, 4326) and UPDATE table_name SET the_geom = ST_Transform(the_geom, 4326) did it.