Conversion Error for CPDFConverter Instance

Error	Description
`ERR_NONE`	None.
`ERR_SUCCESS`	Success.
`ERR_UNKNOWN`	Unknown error in processing conversion.
`ERR_ENCRYPTED`	Password required or incorrect password.
`ERR_INTERRUPT`	Conversion process interrupted.
`ERR_PERMISSION`	The license doesn't allow the permission.
`ERR_MALLOC`	Malloc failure.
`ERR_CONVERTING`	A file is already being converted, so other files could not be converted at the same time.
`ERR_PDFERROR`	Unknown error in processing PDF.
`ERR_FILE`	File not found or could not be opened.
`ERR_FORMAT`	File not in PDF format or corrupted.
`ERR_SECURITY`	Unsupported security scheme.
`ERR_PAGE`	Page not found or content error.

Get the corresponding error code when conversion fails:

ConvertError error = ConvertError.ERR_UNKNOWN;
converter.Convert(outputFolderPath, ref outputFileName, pageArray,ImgType.JPEG, ref error, getPorgress);