As the error indicates, you have data present in the DSA (within dsaname.db file under DATA location) that contains attributes and values while the actual attributes (SCHEMA .dxc file) are not present in the definition. Most commonly you are missing to 'source' in the correct SCHEMA .dxc file for this DSA. If not sure, please review DXHOME/config/servers/dsaname.dxi file and see what is being 'sourced' under SCHEMA section and make sure you are sourcing all correct (various) schema .dxc files that are tied to the data already present in your DSA.
During the startup phase, DSA (behind the scene) performs a one-one check on existing data with known attribute(s) definition. If anything is missing, it reports the error mentioned above.