Slim Application Error

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{"result":"false","message":"SOAP-ERROR: Parsing WSDL: Couldn't load from 'https:\/\/s.piotr.c:[email protected]\/api\/soap\/wsdl\/promotion.wsdl' : failed to load external entity \"https:\/\/s.piotr.c:[email protected]\/api\/soap\/wsdl\/promotion.wsdl\"\n"}