Advantage Error Guide
The index key size is too large for the page file size. If you are creating a new index order in an existing index file, Advantage will attempt to automatically rebuild the index with a large enough page size for the new index being built. If it cannot do this, it will be necessary to reindex the file with a larger page size. If you are creating an index order in a new index file, then you should either specify a larger page size or allow Advantage to compute the default page size.
See Index Key Size and Page Size Relationships for the specific equations.