[Solution] Emqx startup under win10 reports Unable to load emulator DLL, node.db_role = EMQX_NODE__DB_ROLE = core

Problem Description 1:

Error at startup: emqx startup error under win10 Unable to load emulator DLL

D:\Applications_installed\emqx-5.0.4-windows-amd64\bin>emqx startUnable to load emulator DLL(D:\Applications_installed\emqx-5.0.4-windows-amd64\erts-12.2.1\bin\beam.smp.dll)There should be no SET at this point.D:\Applications_installed\emqx-5.0.4-windows-amd64\bin>@if ===/ SET data_dir="

Solution:

• Install Erlang/OTP 25.0.3 (latest version as of 2022.7.22)
  Official website download address: https://www.erlang.org/downloads

• If prompted to install C++, select Install and reboot.

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Problem description 2:

Running emqx start under emqx-5.0.4-windows-amd64 shows:

D:\Applications_installed\emqx-5.0.4-windows-amd64\bin>emqx startnode.db_role = EMQX_NODE__DB_ROLE = corenode.db_backend = EMQX_NODE__DB_BACKEND = mnesia

Solution:

• Switch version: emqx-4.4.6-otp24.2.1-windows-amd64
  
• https://www.emqx.com/en/try?product=brokerli>