MessageToPost should contain at least one attachment

[SofiaRay]

Добрый день, формирую запрос в формате JSON, метод PostMessage

В теле передаю вот так:

{
"FromBoxId": "cd713b6c69c44b4f912120cd4ee28679@diadoc.ru",
"ToBoxId": "b5481fd919de425dbb6e7f9af360253a@diadoc.ru",
"MessageFromBoxId": "cd713b6c69c44b4f912120cd4ee28679@diadoc.ru",
"MessageToBoxId": "b5481fd919de425dbb6e7f9af360253a@diadoc.ru",
"MessageToDepartmentId": "bbaddddc-1954-48c6-880b-acaab474e720",
"DocumentAttachment": [{
"FileName": "test.pdf",
"NeedRecipientSignature": false,
"DocumentDate": "22.11.2017",
"Comment": "Test message",
"DocumentNumber": 123456,
"NeedReceipt": false,
"SignedContent": {
"Content": "UEsDBBQABgAIAAAAIQBBN4LPbgEAAAQFAAATAAgCW0NvbnRlbnRfVHlwZXNdLnhtbCCiBAIooAACAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACsVMluwjAQvVfqP0S+Vomhh6qqCBy6HFsk6AeYeJJYJLblGSj8fSdmUVWxCMElUWzPWybzPBit2iZZQkDjbC76WU8kYAunja1y8T39SJ9FgqSsVo2zkIs1oBgN7+8G07UHTLjaYi5qIv8iJRY1tAoz58HyTulCq4g/QyW9KuaqAvnY6z3JwlkCSyl1GGI4eINSLRpK3le8vFEyM1Ykr5tzHVUulPeNKRSxULm0+h9J6srSFKBdsWgZOkMfQGmsAahtMh8MM4YJELExFPIgZ4AGLyPdusq4MgrD2nh8YOtHGLqd4662dV/8O4LRkIxVoE/Vsne5auSPC/OZc/PsNMilrYktylpl7E73Cf54GGV89W8spPMXgc/oIJ4xkPF5vYQIc4YQad0A3rrtEfQcc60C6Anx9FY3F/AX+5QOjtQ4OI+c2gCXd2EXka469QwEgQzsQ3Jo2PaMHPmr2w7dnaJBH+CW8Q4b/gIAAP//AwBQSwMEFAAGAAgAAAAhALVVMCP0AAAATAIAAAsACAJfcmVscy8ucmVscyCiBAIooAACAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACskk1PwzAMhu9I/IfI99XdkBBCS3dBSLshVH6ASdwPtY2jJBvdvyccEFQagwNHf71+/Mrb3TyN6sgh9uI0rIsSFDsjtnethpf6cXUHKiZylkZxrOHEEXbV9dX2mUdKeSh2vY8qq7iooUvJ3yNG0/FEsRDPLlcaCROlHIYWPZmBWsZNWd5i+K4B1UJT7a2GsLc3oOqTz5t/15am6Q0/iDlM7NKZFchzYmfZrnzIbCH1+RpVU2g5abBinnI6InlfZGzA80SbvxP9fC1OnMhSIjQS+DLPR8cloPV/WrQ08cudecQ3CcOryPDJgosfqN4BAAD//wMAUEsDBBQABgAIAAAAIQCBPpSX8wAAALoCAAAaAAgBeGwvX3JlbHMvd29ya2Jvb2sueG1sLnJlbHMgogQBKKAAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACsUk1LxDAQvQv+hzB3m3YVEdl0LyLsVesPCMm0KdsmITN+9N8bKrpdWNZLLwNvhnnvzcd29zUO4gMT9cErqIoSBHoTbO87BW/N880DCGLtrR6CRwUTEuzq66vtCw6acxO5PpLILJ4UOOb4KCUZh6OmIkT0udKGNGrOMHUyanPQHcpNWd7LtOSA+oRT7K2CtLe3IJopZuX/uUPb9gafgnkf0fMZCUk8DXkA0ejUISv4wUX2CPK8/GZNec5rwaP6DOUcq0seqjU9fIZ0IIfIRx9/KZJz5aKZu1Xv4XRC+8opv9vyLMv072bkycfV3wAAAP//AwBQSwMEFAAGAAgAAAAhAPzHXAFTAwAASwcAAA8AAAB4bC93b3JrYm9vay54bWysVV1u2zgQfl+gd9ASeZVF6s+2YLuwZRkbIC2CNm1fDASMREeEJVFLUrGDoA/dC+wB9iILLLBnSG60Q9lynOQlbdewSZFjffxm5pvh6O22LKwbJhUX1RiRHkYWq1KR8ep6jD5dLOwBspSmVUYLUbExumUKvZ28+WW0EXJ9JcTaAoBKjVGudR05jkpzVlLVEzWrwLISsqQalvLaUbVkNFM5Y7osHBfj0Ckpr9AOIZKvwRCrFU/ZXKRNySq9A5GsoBroq5zXqkMr09fAlVSum9pORVkDxBUvuL5tQZFVptHpdSUkvSrA7S0JrK2Ebwg/gmFwu5PA9OKokqdSKLHSPYB2dqRf+E+wQ8iTEGxfxuB1SL4j2Q03OTywkuEPsgoPWOEjGME/jUZAWq1WIgjeD6IFB24umoxWvGCfd9K1aF2/p6XJVIGsgiqdZFyzbIz6sBQb9mRDNvWs4QVYXezjIXImBzmfSytjK9oU+gKE3MFDZYTh0A3MP0EY00IzWVHNYlFp0OHer5/VXIsd5wIUbn1gvzdcMigs0Bf4CiNNI3qlzqnOrUYWYxRHy08K3F+qnlaCL+dMrbWol/f/PPx5/+/ySJ/0ZTF8h0Jpatx2wO8dt93z8xgARRl1KjzX0oLn0/kZZOIjvYG8QPazfdmeQuCJd1mlMiKXd27iL9xg4drubBjafhDG9szzFnafTONgRtyFR5Kv4IwMo1TQRuf7lBvoMfKMSJ+b3tFtZyE4anj2SOMO7z+2mZ8Nne2rcdg0t8+cbdSjOMzS2n7hVSY2rUe3R8+bdvsLz3QOunI9L0DWbu83xq9z4EpIgGET5G84jdFd7A6G2J8mtjsfEtsP/dAe4PncTrzYi5P+LPamXsvFOSLTNlAg1c5W1Yr+/q/7vx++PfxBoFmb/tpGGFkyMsfI04y0GezeBIHzimWmXgDnaLVHu9wWVdk7l7zSl1Po2aaCUlp87JAxmhwO/PVkekKik7MTD4+cIygQydNjACCF4jJTy25IsNtWHtvqM6UnI5hB1xzCQnw87eOhb+PEC2x/MHTtge+5duzP3SToJ/NkFhhFmIsn+j/ab1teUXejGZY5lfpC0nQN9+AHtppRBRLeRRF4gnMda6d7a/IfAAAA//8DAFBLAwQUAAYACAAAACEAbbNhyboHAAAdGwAAFAAAAHhsL3NoYXJlZFN0cmluZ3MueG1s7FlbbxNXEH6v1P9wtFIRSKnXdgIJITYPSDz3oX2uTDCJJV9S74JKn3KhUJSUXAgQBXKBQKVKrWqSuJiEOFJ/wexf6C/pN3OOHe+e3ZAUVcpDA4H12XOZM/PNzDfjkavfV8rqTrHulWrVnJNJpR1VrI7WbpaqYznnm6+vfznkKM8vVG8WyrVqMefcLXrO1fznn414nq+wturlnHHfnxh2XW90vFgpeKnaRLGKN7dq9UrBx8f6mOtN1IuFm954sehXym42nb7kVgqlqqNGa7erfs4ZHHTU7Wrpu9vFa2Yg6+RHvFJ+xM/TM1qgP2iJVmlhxPXzIy6Pm3eripZpnR7jdwm/m7SlaAMPL+kVVvGaFfX3vafRdefK/pVzY/6VuHHapUYwTY3zeNhN0Qf6kKId/edC4poDrJmiJu0Hi3RAB8EsvVd0GMzgw14wHbcsJOavtEKr1uX4Iqu0hZkLuM4Tek6/WXMWcPcntEavwveWDW198b0hUhu3agaTit5B7Hnapj1qJV5tL5gUhexhWVNhdYNavF722canA3zGi0NqB1OsONoOHmJojxqfvGcbZ++YI1jW+9g3VtJMiu8fEUBB4re43zvYoRlMQ7p5DOG/GQjYFGG3qYUXcyHpYbEZ2Y0fcC1GA1v2kYIV2tBWgzUiSxQkYkXg+i1F26wd0S2bnfZ5Jc6apGafwk5QCCuc8YFZwAcr7k9qDtuGx5oW5rKu98RKncX23GXsBdXjNGxnJJ0TBDZxKEC5LzK3+O49JmKT25s9w4FmM+itqzNLs3xLS+rkxWFFQmPW4hgfpUOXDq1D1pLg12Ma20mCSWgGkIQV9q23T+DoLdHefTYrK17cQywLvcVeNGxM2J/dYx8WeNBFVlsQ0UQQsXb4RfbGYcCDwnNXgGCmT9FbjLxTcOplenm6pcFU0rKX2jMZR0lT1uEsDzkgdFCt5Yvgdodwrx5lA9pTDDS+9zTjIml7gIh2MWWbQw9wvys6YFdI0l7oFNaSrUi+Vlvikfi+8eSEc0R02064Zq9fn+8q8UJE+Zzvhr2JwijyIBKaV6zfKTp5jjtxB0oOQJCZxGs48e5RdGLfU1HDZqzLZe3rrkBSyXYnk4wzJ7ImPQM8OVG2EUw5gCGsIsTB5ywp8Go6NimGk0YHE8fkw26OwcWPjo3PCYB6dzpHEeNcccFOUrMCJ0ieJUnOJHHR+8eODy/gEG0EiLleAgYWgADEeYZO1NCuknDCqRGeEw3BUQsk7L+sOYm1nsMVog580OAMpx2Kg7UYlf/6vK1w4uAUo9PZ7PAJJX7MGEN8M9lJIkQnk86ddBMr8ZxiYSR722fmwQ8bnNc5NB6fZQUhpyBCkbPnk4mQthLTKBEkmE2c2mCIcUa3IPbJNGvnGFsly951sQimk8SJspEeUCUueRRMgtn1eNcpWKYmQ3CGe1DywYkJqsTzMPMDP+wI+wAOx9ZCsgs7175OZzrqc1ISnihFgAiCvKgds8kBmIsMtqOQRyRDVAzBj9qLkec0NWX6IIZ5C2zM4zXzQYxwqWHSrS40Oh8V5NrhLTWgbdbWsCNqN/OFUYUDP0L/NP/FiSbwBTPDfH5SGIQVY3J1NFZKKcKOADYht2UVCMVmSt6Tpa3UmEn9tYmqb5NLJrsElLS5BBxt0kJUB/ERN6v307XkOi1+ZE8rkfbz+nVg6bkUbwssPdeosSLk8Qp/FP2OWRsKJd0Gn7iCvLjmIoNv0MawGhzMDlzMDFzOpF08DqUz6XQGaHAREAbSg+nsUCaNwlp+Bi/1XxbyuSjlxh4zLL3neQiwfkHRDuzxghkJUh2A2nciPgEWwaf14+hMz2npoWw/WOsi17AqPTBwMXsRI3GsuVNrCrKn4AVgG8IHuTbjJ1R3hk721C1InyiuQuyFGlEAJHOzTlGqqW+ogovWgiHUA3mo+wwSpcJ9I84Het7GaIsdcpdrP5RyOihzuTcrfhHDB6UAExeQTC0lILQm1ZYkR8SV4CfZjdmNVpWUA9JbYPaAIIC6lSvH7gRTdnb1qAtQm9YdQt6pYI6ZiClcf0ZCb3JzwohjalKOrw/44jb5fC0NlhcELG8Bp0voO2zSUxiG+w92a4ZdZxnQXYFbrsD7xQHYJ9ai0Pg29OPSa6xZdy0AvUjRRkSqOhpE8ZbvT3FLgAOoVN2moDOKwTL++xX+8X5QdwrlnHPZcfMjo7Vyra7qYzdyznX8sC/xcP16rerradcK5dKNeolHbxUqpfJdPZyV1eOFulc0E7PpAR6TnlhRT6qUqrU6D7pysp+nN/qOx4vjo6uGgiPzH0oSr0L1BXdLpjkrhYosxtyRGyHRSag5giS6HbqO1k0iAItj/wx30qRtIoAzgERTpZPiBNknUcj/9tGFp+45gFSwH/cpQbsVsaSU0dyE+dqkYRqxkQvZgEs1Jvr8ZHp7nQYIUNrtvCb7HS1JH1RK7fhW4fuz5YRM7bkl2IEn99CkYFVHpPSsOqimSNzkfIgUAlcy9wBZOlOOJOVTcgg4+4o+yzHqrGcR6Yx2oxSnZN0mFA7FNA+MRFqdhpiY7xCwDC8wO4kn4jso+TaoNy75ec3EQJI0o2S3kG8jUH7pxg5KQV1+MclBYTVnqCcaUD3kwsXXW/l/AAAA//8DAFBLAwQUAAYACAAAACEAO20yS8EAAABCAQAAIwAAAHhsL3dvcmtzaGVldHMvX3JlbHMvc2hlZXQxLnhtbC5yZWxzhI/BisIwFEX3A/5DeHuT1oUMQ1M3IrhV5wNi+toG25eQ9xT9e7McZcDl5XDP5Tab+zypG2YOkSzUugKF5GMXaLDwe9otv0GxOOrcFAktPJBh0y6+mgNOTkqJx5BYFQuxhVEk/RjDfsTZsY4JqZA+5tlJiXkwyfmLG9Csqmpt8l8HtC9Ote8s5H1Xgzo9Uln+7I59Hzxuo7/OSPLPhEk5kGA+okg5yEXt8oBiQet39p5rfQ4Epm3My/P2CQAA//8DAFBLAwQUAAYACAAAACEAEuuBOnwHAAD5IAAAEwAAAHhsL3RoZW1lL3RoZW1lMS54bWzsWc1uHDcSvgfIOzT6Pp6/7vkRPA7m14ot2YY1duAjNcOZpsVuDkiO5IFhIHBOuSQI4F3sZYFkL3sIgghYLxIsNthXUJ7BgI2N8xApsnumSQ3Hlh058C4kAVI3+6tisar6Y3Xx8kcPYuodYi4IS1p++VLJ93AyYmOSTFv+neGg0PA9IVEyRpQluOUvsPA/uvLhB5fRloxwjD2QT8QWavmRlLOtYlGMYBiJS2yGE3g2YTxGEm75tDjm6Aj0xrRYKZVqxRiRxPcSFIPak7+d/PPk3yfH3s3JhIywf2Wpv09hkkQKNTCifE9px0uhb35+fHJ88tPJ05Pjnz+F65/g/5dadnxQVhJiIbqUe4eItnyYesyOhviB9D2KhIQHLb+kf/zilctFtJUJUblB1pAb6J9MLhMYH1T0nHy6v5o0CMKg1l7p1wAq13H9er/Wr630aQAajWDlqS22znqlG2RYA5ReOnT36r1q2cIb+qtrNrdD9WvhNSjVH6zhB4MueNHCa1CKD9fwYafZ6dn6NSjF19bw9VK7F9Qt/RoUUZIcrKFLYa3aXa52BZkwuu2EN8NgUK9kynMUZMMq29QUE5bIs+ZejO4zPgABJUiRJIknFzM8QSNI9C6iZJ8Tb4dMI0jEGUqYgOFSpTQoVeGv+g30lY4w2sLIkFZ2gmVibUjZ54kRJzPZ8q+BVt+APP/xx2ePnz57/MOzzz579vj7bG6typLbRsnUlHv5969+/eun3i//+Prlkz+lU5/GCxP/4rvPX/zrP69SDyvOXfH8z8cvnh4//8sX//32iUN7m6N9Ez4kMRbeDXzk3WYxLNBhP97nbyYxjBCxJFAEuh2q+zKygDcWiLpwHWy78C4H1nEBr87vW7buRXwuiWPm61FsAXcZox3GnQ64ruYyPDycJ1P35Hxu4m4jdOiau4sSK8D9+Qzol7hUdiNsmXmLokSiKU6w9NQzdoCxY3X3CLH8uktGnAk2kd494nUQcbpkSPatRMqFtkkMcVm4DIRQW77Zvet1GHWtuocPbSS8Fog6jB9iarnxKppLFLtUDlFMTYfvIBm5jNxb8JGJ6wsJkZ5iyrz+GAvhkrnJYb1G0K8Dw7jDvksXsY3kkhy4dO4gxkxkjx10IxTPnDaTJDKxH4sDSFHk3WLSBd9l9hui7iEOKNkY7rsEW+F+PRHcAXI1TcoTRD2Zc0csr2Jmv48LOkHYxTJtHlvs2ubEmR2d+dRK7R2MKTpCY4y9Ox87LOiwmeXz3OhrEbDKNnYl1jVk56q6T7DAnq5z1ilyhwgrZffwlG2wZ3dxingWKIkR36T5BkTdSl3Y5ZxUepOODkzgDQIVIuSL0yk3Begwkru/SeutCFl7l7oX7nxdcCt+Z3nH4L28/6bvJcjgN5YBYj+zb4aIWhPkCTNEUGC46BZErPDnImpf1WJzp9zEfmnzMEChZNU7MUleW/ycKnvCP6bscRcw51DwuBX/nlJnE6VsnypwNuH+B8uaHpontzDsJOucdVHVXFQ1/v99VbPpXb6oZS5qmYtaxvX19U5qmbx8gcom7/roHlB85hbQhFC6JxcU7wjdBRLwhTMewKBuV+ke5qpFOIvgMmtAWbgpR1rG40x+QmS0F6EZtIrKusE5FZnqqfBmTEAHSQ/r7is+pVv3oebxLhunndByWXU9U5cKJPPxUrgah66VTNG1et7dW6nX/dKp7souDVCyb2KEMZltRNVhRH05CFF5lRF6ZediRdNhRUOpX4ZqGcWVK8C0VVTgE9yDD/eWHwZphxmac1Cuj1Wc0mbzMroqOOca6U3OpGYGQMm9zIA80k1l68blqdWlqXaGSFtGGOlmG2GkYQQfxll2mi3584x1Mw+pZZ5yxfJtyM2oN95FrBWpnOIGmphMQRPvqOXXqiEcxIzQrOVPoIMMl/EMckeorzBEp3BSM5I8feHfhllmXMgeElHqcE06KRvERGLuURK3fLX8VTbQRHOItq1cAUJ4b41rAq28b8ZB0O0g48kEj6QZdmNEeTq9BYZPucL5VIu/PVhJsjmEey8aH3n7dM5vI0ixsF5WDhwTAQcJ5dSbYwInZSsiy/Pv1MaU0a55VKVzKB1HdBahbEcxyTyFaxJdmaPvVj4w7rI1g0PXXbg/VRvs7951X79VK88ZpJnvmRarqF3TTabvbpM3rMo3UcuqlLr1N7bIua655DpIVOcu8Zpd9wwbgmFaPpllmrJ4nYYVZ2ejtmnnWBAYnqht8Ntqj3B64m13fpA7nbVqg1jWmTrx9Sm7eQrO9u8DefTgPHFOpdChhDNtjqDoS08oU9qAV+SBzGpEuPLmnLT8h6WwHXQrYbdQaoT9QlANSoVG2K4W2mFYLffDcqnXqTyCjUVGcTlMT/gHcKRBF9k5vx5fO+uPl6c2l0YsLjJ9hF/Uhuuz/nLFOutPj/i9oTrJ9z0CpPOwVhk0q81OrdCstgeFoNdpFJrdWqfQq3XrvUGvGzaag0e+d6jBQbvaDWr9RqFW7nYLQa2kzG80C/WgUmkH9XajH7QfZWUMrDylj8wX4F5t15XfAAAA//8DAFBLAwQUAAYACAAAACEAt/iUdR8FAAD2KAAADQAAAHhsL3N0eWxlcy54bWzsWt2O4jY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}
}]
}

В ответе возвращается ошибка:
MessageToPost should contain at least one attachment.

Подскажите пожалуйста, в чем проблема?