=============== Troubleshooting =============== Here we list issues that other users have encountered, and how to solve them! **If you encounter a new issue please make an "Issue" on the GitHub so I can fix it!** `GitHub Issues `_ Jupyter notebook kernel died ---------------------------- If you repeatedly get a ``Kernel Restarting`` message on your jupyter notebook with something like:: The kernel for NOTEBOOK.ipynb appears to have died. It will restart automatically. Then the issue might be how ``PyTorch`` and Jupyter talk to each other. This is a known problem that can occur (for example `see here `_). The solution that works for most people is to just re-install ``PyTorch``. My images look mirrored ----------------------- If you load a target image into ``AstroPhot`` and then try to plot it using one of the built-in plotting routines, you may notice that the image is flipped horizontally. This is likely because your pixelscale matrix has negative values such as:: [[-1, 0] [ 0, 1]] This is totally normal, it comes from the fact that ``RA`` is defined as positive to the east (left side of a typical image). Most astrophot plotting routines that may be affected by this have an argument to fix it, just set: ``flipx = True`` in the plotting function and you should be good to go! Otherwise you can do it manually in matplotlib with ``ax.invert_xaxis()``. My object/images aren't where they should be -------------------------------------------- If you objects aren't where they should be in an image, or your images aren't aligning properly, its possible that your coordinate system is misspecified. Please read the :doc:`coordinates` documentation to get some clarity on how AstroPhot handles coordinates. If that doesn't work, contact me!