Regex Error while entering interval for Sales

[jeemiing]

Hello Team,

when I try to access Sales Data, entering a interval constantly returns this regex error. I tried everything and even when I use the example interval from the documentation, this error appears.

sp_api.base.exceptions.SellingApiBadRequestException: [{'code': 'InvalidInput', 'message': '{getOrderMetrics.arg1=must match "[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\\.[0-9]{3})?(([+-]\\d\\d:\\d\\d)|Z)(\\[[a-zA-Z/_]+\\])?--[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\\.[0-9]{3})?(([+-]\\d\\d:\\d\\d)|Z)(\\[[a-zA-Z/_]+\\])?"}', 'details': ''}]
My Code is:
sales = Sales(credentials=credentials, marketplace=Marketplaces.DE) sales.get_order_metrics('2018-09-01T00:00:00-07:00--2018-09-04T00:00:00-07:00', granularity=Granularity.DAY)