The setting issue of the Limb Darkening

[ty406-cyber]

Could not lookup ld_coeffs for ld_coeffs_source@secondary@lcB@lc@dataset. Try changing ld_coeffs_source to a table that covers a sufficient range of values or set ld_mode to 'manual' and manually provide coefficients via ld_coeffs. Enable 'warning' logger to see out-of-bound arrays.

[Raindogjones]

The temperature you are using is too low for the ck2004 atmospheres, see the ValueError line in the screenshot which tells you the parameters. Doesn't tell you exactly which is out-of-bounds but I can tell you it is the temperature. So, either switch to 'phoenix' atmospheres which go lower, or to 'blackbody' and manually set the limb-darkening coefficients as suggested by the final error.