При проверки подписи сталкиваюсь с ошибкой "не найден автор исходной подписи"

язык - javascript

выполняю следующие:
var oSignedData = cadesplugin.CreateObject("CAdESCOM.CadesSignedData");
oSignedData.ContentEncoding = cadesplugin.CADESCOM_BASE64_TO_BINARY;
oSignedData.Content = dataBase64;
oSignedData.VerifyCades(signBase64, cadesplugin.CADESCOM_CADES_BES, true);

в чем может быть проблема?

dataBase64:
Q29udGVudC1UeXBlOiB0ZXh0L3BsYWluOyBjaGFyc2V0PXV0Zi04OyBmb3JtYXQ9Zmxvd2VkDQpDb250ZW50LVRyYW5zZmVyLUVuY29kaW5nOiBxdW90ZWQtcHJpbnRhYmxlDQpDb250ZW50LUxhbmd1YWdlOiBlbi1VUw0KDQoxMjMNCg0K

signedData:
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q252g1DZPsVQmXGBkr5Qxx87t/Nr4/flhw+kao344gzW9lCmkFq73wAAAAAAAA==