Resolving dependencies...
Starting     grid-7.8.14
Building     grid-7.8.14
Completed    grid-7.8.14
Starting     som-10.0.0
Building     som-10.0.0
Failed to install som-10.0.0
Build log ( /home/builder/.cabal/logs/ghc-8.10.2/som-10.0.0-Z0Y4iFyWw19xgreVn2g0z.log ):
cabal: Entering directory '/tmp/cabal-tmp-17095/som-10.0.0'
Configuring som-10.0.0...
Preprocessing library for som-10.0.0..
Building library for som-10.0.0..
[1 of 9] Compiling Data.Datamining.Clustering.Classifier ( src/Data/Datamining/Clustering/Classifier.hs, dist/build/Data/Datamining/Clustering/Classifier.o, dist/build/Data/Datamining/Clustering/Classifier.dyn_o )
[2 of 9] Compiling Data.Datamining.Clustering.DSOMInternal ( src/Data/Datamining/Clustering/DSOMInternal.hs, dist/build/Data/Datamining/Clustering/DSOMInternal.o, dist/build/Data/Datamining/Clustering/DSOMInternal.dyn_o )

src/Data/Datamining/Clustering/DSOMInternal.hs:83:3: error:
    " Illegal nested constraint G.FiniteGrid (GM.BaseGrid gm p)
      (Use UndecidableInstances to permit this)
    " In the instance declaration for GM.GridMap (DSOM gm x k) p
   |
83 |   (F.Foldable gm, GM.GridMap gm p, G.FiniteGrid (GM.BaseGrid gm p)) =>
   |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^...
cabal: Leaving directory '/tmp/cabal-tmp-17095/som-10.0.0'
cabal: Error: some packages failed to install:
som-10.0.0-Z0Y4iFyWw19xgreVn2g0z failed during the building phase. The
exception was:
ExitFailure 1