Odoo Server Error Traceback (most recent call last): File "/usr/lib/python3.6/site-packages/odoo/enterprise/account_reports/controllers/main.py", line 31, in get_report report_obj.get_xlsx(options, response) File "/usr/lib/python3.6/site-packages/odoo/enterprise/account_reports/models/account_report.py", line 1091, in get_xlsx workbook = xlsxwriter.Workbook(output, {'in_memory': True}) AttributeError: 'NoneType' object has no attribute 'Workbook'