Ignore the error and add that animal companion race. Then, go to the Adjustments tab, add "Animal Companion, Allowed Class" to the Permanent Adjustments table, and choose "Ranger" as the class it's allowed for.
If you don't mind it showing up in the list of supressed errors, you can click on the three vertical dots on the error message about the race not being allowed (once you've added it to your character), and choose to suppress the validation error.
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