OneFormPerProcess api response status code 403
when I study with example OneFormPerProcess, after import and run process, I saw a form with disable inputs, when I press F12 and check network, I saw request http://localhost:8080/bonita/portal/resource/process/RealizeEpisode/1.0/API/extension/context?taskId=5653733763933565247&caseId=5653733763933565247&processId=5653733763933565247 response status code 403.
logged user is walter.bates who belong to Administrator role.
how do I resolve this problem? thank you.