A potentially dangerous Request

Hello,

I have a question about SharePoint integration. I have created a connector between appian and sharepoint, where I am trying to use one of the possible operations which is adding a document. To add a document it is required to provide the destination path of the folder and also the document itself. The problem is that despite the fact that I got write and read permission from the administrator for all objects on the page, I still get error:

SharePoint returned a 401 HTTP error

error-result-guidance
SharePoint returned the following information: A potentially dangerous Request.Path value was detected from the client (?).

Tank you,

Michael