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update FAQ
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jameslamb committed Apr 18, 2020
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Expand Up @@ -210,7 +210,7 @@ This is a known bug: `Microsoft/LightGBM#539 <https://github.com/microsoft/Light
3. ``error in data.table::data.table()...argument 2 is NULL``
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If you experiencing this error when running `lightgbm`, you may be facing the same issue reported in `#2715 <https://github.com/microsoft/LightGBM/issues/2715>`_. If you use ``lgb.dl()`` to build from source (i.e. not using pre-compiled dll), you need to upgrade your version of ``data.table`` to at least version 1.12.0.
If you are experiencing this error when running ``lightgbm``, you may be facing the same issue reported in `#2715 <https://github.com/microsoft/LightGBM/issues/2715>`_ and later in `#2989 <https://github.com/microsoft/LightGBM/pull/2989#issuecomment-614374151>`_. We have seen that some in some situations, using ``data.table`` 1.11.x results in this error. To get around this, you can upgrade your version of ``data.table`` to at least version 1.12.0.

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