Resolving dependencies...
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Starting     net-mqtt-0.5.1.0
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Starting     ttn-client-0.2.0.0
Building     ttn-client-0.2.0.0
Failed to install ttn-client-0.2.0.0
Build log ( /home/builder/.cabal/logs/ghc-8.6.3/ttn-client-0.2.0.0-ByLuUlGqFaaGh62jvY5cTN.log ):
cabal: Entering directory '/tmp/cabal-tmp-4441/ttn-client-0.2.0.0'
Configuring ttn-client-0.2.0.0...
Preprocessing library for ttn-client-0.2.0.0..
Building library for ttn-client-0.2.0.0..

on the commandline: warning:
    unrecognised warning flag: -Wunused-packages
[1 of 2] Compiling Data.TTN.Client  ( src/Data/TTN/Client.hs, dist/build/Data/TTN/Client.o )

src/Data/TTN/Client.hs:142:24: error:
    Not in scope: type constructor or class ‘MQTTException’
    |
142 |     [ Handler (\(ex :: MQTTException) -> handler (show ex))
    |                        ^^^^^^^^^^^^^
cabal: Leaving directory '/tmp/cabal-tmp-4441/ttn-client-0.2.0.0'
cabal: Error: some packages failed to install:
ttn-client-0.2.0.0-ByLuUlGqFaaGh62jvY5cTN failed during the building phase.
The exception was:
ExitFailure 1