Solved:
The script included two subsequent role assignments. The first one gave parents access to view the content in their child's course, the second one gave them the ability to view their child's grades. Running them as two method calls triggered the error. When I put both data sets in the same array and made a single call to core_role_assign_roles it worked. Still not sure why that would happen, but it solved the problem.
Thanks all
Doug
The script included two subsequent role assignments. The first one gave parents access to view the content in their child's course, the second one gave them the ability to view their child's grades. Running them as two method calls triggered the error. When I put both data sets in the same array and made a single call to core_role_assign_roles it worked. Still not sure why that would happen, but it solved the problem.
Thanks all
Doug