Abstract: The present invention provides method of treating or lessening the severity of a disease selected from spondyloarthropathy, systemic lupus erythematosus, rheumatoid arthritis, or any combination thereof comprising the administration of a compound of Formula I and an optional co-therapy (e.g., chemotherapy agent, DMARD, or any combination thereof). The present invention also provides a pharmaceutical composition comprising a compound of Formula I, a method of manufacturing a pharmaceutical composition comprising a compound of Formula I, and a method of administering a pharmaceutical composition comprising a solid form of a compound of Formula I.