Missing Address ChecksumYou can fix this error by using the GUI Wallet to produce the checksum. Select View -> Toggle Web Inspector (or use the keyboard shortcut Ctrl + Shift + I).
At the bottom of the console screen, you need to enter the following command (inputting the address where specified):
The address will now be displayed on the following line, with the checksum added to the end. Use this and it will now be accepted as a valid address.
java.net.URISyntaxException: Illegal character in authority at index 6:There is probably an incorrect character or extra space in your list of nodes. If you cannot go to Tools -> Edit Server Configuration within the GUI, then you need to edit your ‘settings.json’ file. In Windows, you can find it in the following directory (replace ‘xxxx’ with your user name):
If this problem persists after editing the settings.json file, try only adding one neighbour to this file and then adding the rest, one by one, in the GUI.