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Bytestring cannot be used

I've created some code in the past that uses Data.Bytestring.Lazy. Now when I try to compile it endless what I get is a bunch of errors. An example of an error:

Couldn't match expected type `BL.ByteString'
                with actual type `bytestring-0.10.0.2:Data.ByteString.Lazy.Internal.ByteString'
    In the return type of a call of `decompress'
    In the second argument of `decrypt', namely `(decompress fc)'
    In the second argument of `BL.filter', namely
      `(decrypt (extractKey tkey) (decompress fc))'

... And many errors like this ...

My import bytestring: import Data.ByteString.Lazy as BL. What to do about it?

EDIT:

Thanks for the help. Everything works fine with an explicit version of the package. But I don't like it. When I try to unregister one of the two installed packages for testing. Many packages will be broken. The newest version of the package breaks a small number of packages (no kernel packages). How to recover packed packages that were destroyed by an unregistered package?

EDIT:

No, it doesn't work fine with an explicit package version. I wrote an edit before I tried it physically. It was a mistake. Nothing works.

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Yes, I solved the problem. The evil package was zlib which uses the old version of bytestring, but all encryption packages use the newer version. When I threw out the code to compress, my program was compiled. Now I am looking for some compression algorithms ...



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