Thther is a warning in staad foundation advanced as per below snap. we are designing pile cap as mat foundation in Indian standard.
Seems like you have not selected any supports while creating the "JOB". Please make sure to select a few supports while creating the job as shown in the attached. You will have to go for option a). "Assign to all supports" which will select all your supports to be included in the job. Option b). Select the required supports form the GUI and choose "assign to selected supports" . Option c.) Use "Assign to listed supports" and manually enter the support numbers
If that doesnt resolve the issue, upload your .sfa file here and we will have a look.