Ctrl + C Copy Ctrl + V Paste on dthmlxScheduler.NET with Version 3.4 Throws Error

After upgrading to 3.14 when we copy and paste using key combination we get " A potentially dangerous Request.From value was detected from the client(text=" <div class='schedule…"). error.

We can’t figure out a way to resolve this particular issue.

Accordingly to the error most probably there is some html-content in your pasting data causing your server to throw this alert, due to security reasons.
Could you please, clarify your using code and the steps to copy/paste the data.