When I attempt to do a foundation design I get an error "Error in spacing calculation along length, please check minimum spacing provided". What does the error mean?
Most likely the spacing that the software is calculating for your job is coming out to be lesser than the minimum spacing specified.
If you are designing isolated footing, you may go to the Isolated Footing Job > Design Parameters > Concrete & Reinforcement from inside the Main Navigator window and change the Minimum Bar spacing. You may also use higher bar sizes ( Maximum footing bar size ) to allow higher bar spacing.
If you are designing a mat, there is a Design Parameters section witin Mat/Slab analysis/design options, from where you can control the reinforcement spacing. Max spacing and Min spacing are the parameters that you need to play with. You may want to increase the range by increasing the Max spacing and reducing the Min spacing. As before, you may also increase the Max bar size so that the spacing can be increased.