I was wondering what are congenital metabolic errors?

Errors in code: We are born with detailed information in our dna (genes) that direct the formation of the specific protein, fat and sugar structures needed for our body to function. If/when there is a mutation in the genes, that information can be changed to the point it will not work. The enzymes or co factors are lost and the system breaks down.There are thousands of these potential errors, pku is a common one.