I am new to Demantra. Have installed a stand alone Demantra system in our server. In order to load data, I created a new model, defined item and location levels, then clicked on 'Build Model'. The data is loaded into 3 custom tables created by me. After creating the model, I cannot login to 'Collaborator Workbench', it gives message 'There are system errors. Please contact your System Administrator'. Can anyone please tell me what I am doing wrong and how to resolve the issue.