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Hi Myrunaya
Please pose this question on the Discussion board of the PyMAPDLGitHub site https://github.com/ansys/pymapdl
There are multiple causes of this so it may take some work to narrow down what is happening with your specific set-up. But normally the first thing to try is setting the "start_timeout" to a larger value on the launch_mapdl command. See here:
https://mapdl.docs.pyansys.com/version/stable/api/_autosummary/ansys.mapdl.core.launcher.launch_mapdl.html#ansys.mapdl.core.launcher.launch_mapdl
Mike