session limit reached

agent_sandbox.core.api_error.ApiError: headers: {'connection': 'close', 'content-length': '153', 'content-type': 'application/json', 'date': 'Tue, 11 Aug 2026 11:24:49 GMT', 'server': 'nginx/1.18.0 (Ubuntu)'}, status_code: 400, body: {'success': False, 'message': 'Cannot create shell session: session limit reached and all 0 existing sessions have active commands', 'data': None, 'hint': None}
During task with name 'tools' and id 'b4ec91f9-5cf6-3f45-9d59-3a57792bc2e9'

请问这个怎么解决？