Error with docker-compose up

I get this error after fllowing all steps:

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kit-00035-00033 2019-07-19 09:59:55.505555 [ loolkit ] INF  Linking file "/opt/libreoffice/program/resource/ug/LC_MESSAGES/cui.mo" to "/opt/lool/child-roots/qW9NjvFiGJt03gh3/lo/program/resource/ug/LC_MESSAGES/cui.mo"| kit/Kit.cpp:213
libreoffice    | Failed to fork child processes.
libreoffice    | wsd-00031-00031 2019-07-19 09:59:55.538767 [ loolwsd ] FTL  Failed to fork child processes.| wsd/LOOLWSD.cpp:3217
libreoffice    | FATAL: Failed to fork child processes.
libreoffice    | Failed to fork child processes.
libreoffice    | wsd-00031-00031 2019-07-19 09:59:55.538876 [ loolwsd ] FTL  Failed to fork child processes.| wsd/LOOLWSD.cpp:3388
libreoffice    | Failed to fork child processes.
libreoffice    | wsd-00031-00031 2019-07-19 09:59:55.540124 [ loolwsd ] INF  ~Admin dtor.| wsd/Admin.cpp:376
libreoffice    | wsd-00031-00031 2019-07-19 09:59:55.540138 [ loolwsd ] TRC  History:
libreoffice    |
libreoffice    | { "documents" : [], "expiredDocuments" : []}
libreoffice    | | wsd/AdminModel.cpp:182
libreoffice    | wsd-00031-00031 2019-07-19 09:59:55.540148 [ loolwsd ] INF  AdminModel dtor.| wsd/AdminModel.cpp:183
libreoffice    | Pipe closed.
libreoffice    | frk-00033-00033 2019-07-19 09:59:55.541573 [ forkit ] FTL  Pipe closed.| common/IoUtil.cpp:308

Operating system: CoreOS