The URI to be encoded contains an invalid character
You attempted to encode a string as a URI (Uniform Resource Identifier), but it contained invalid characters. Although most characters are valid inside strings to be converted to URIs, some Unicode character sequences are illegal.
To correct this error
Ensure the string to be encoded contains only valid Unicode sequences. A complete URI is composed of a sequence of components and separators. The names in angle brackets represent components, and the ":", "/", ";" and "?" are reserved characters used as separators. The general form is:
<Scheme>:<first>/<second>;<third>?<fourth>