git clone esp-iot-solution错误，https://git.ugfx.io/ugfx/ugfx.git失效怎么解决？

当我按照esp-iot-solution页面的步骤下载环境时，使用git clone命令过程发生如下错误，仓库子模块无法下载，应该是链接失效，希望修复

Cloning into '/mnt/d/workspace/esp32/esp-iot-solution/components/hmi/ugfx_gui/ugfx'...
fatal: unable to access  gnutls_handshake() failed: The TLS connection was non-properly terminated.
fatal: clone ofinto submodule path '/mnt/d/workspace/esp32/esp-iot-solution/components/hmi/ugfx_gui/ugfx' failed
Failed to clone 'components/hmi/ugfx_gui/ugfx' a second time, aborting