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 general form is:
<Scheme>:<first>/<second>;<third>?<fourth>
The names in angle brackets represent components, and the ":", "/", ";" and "?" are reserved characters used as separators.