Unsatisfiable requirements detected for package DifferentialEquations

General Usage
,
1 
pkg> update
ERROR: Unsatisfiable requirements detected for package DifferentialEquations [0c46a032]:
 DifferentialEquations [0c46a032] log:
 ├─DifferentialEquations [0c46a032] has no known versions!
 └─restricted to versions * by an explicit requirement — no versions left
2

Uhh… what? Did the registry get deleted on your local machine?