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Assuming you've entered the correct information for your equipment (guide scope focal length, pixel size of guide camera etc), and assuming you have obtained good polar alignment, shift-clicking the start guiding button will force a calibration routine to run.
If it is saying "cannot make necessary corrections in RA" that sounds like a comms / mount problem. What mount are you using? ST4 cable should work, but you can also bypass it completely depending on how you are controlling your mount. I don't use the ST4 port, I just have the USB cable into my guide camera, which runs to my hub, into my laptop, and as my mount is controlled via EQMOD, the ST4 port is not required. If you use the handset for your mount, you would need ST4 I assume.
PHD2 will also guide you through recommended settings in EQMOD for your mount, which you should heed.
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