Hi! I am using this code to run gsea: fgsea( pathways = hallmark, stats = fc_vec, scoreType = 'std', minSize = 15, maxSize = 500, nPermSimple = 1000000)

Some of the pathways return "N/A" for p values, enrichment scores, etc., other pathways gave me a number for . Why is this the case? I do notice that increasing nPermSimple helps sometimes (i.e. the N/A became numbers). What should I do to fix this problem?

thank you!