# Running the Feko Solver

Run the Solver to compute the calculation requests.

1. Run the Solver.
2. Investigate any warnings/errors found by the Solver (if applicable).
3. Address any errors and rerun the Solver (if applicable).
Note: The following warning may be encountered when running the Solver:
Directivity cannot be computed for far field calculations involving the
planar multilayer Green's function with losses in the dielectric layers,
gain will be computed instead.

Losses cannot be calculated in an infinitely large medium as is required for the extraction of antenna directivity information.

Avoid this warning by requesting the far field gain instead of the directivity. Open the Request/Modify far fields dialog, click the Advanced tab and then click Gain.