Update the xArm Firmware and the xArm Studio to the latest version(≥1.5.0) will solve the problem.
Here is the guidance to update the xArm Firmware and the xArm Studio:
If you do not want to upgrade firmware and xArm Studio, a alternative choice is modify the time of the xArm controller. Please check the steps below:
Please make sure that the Firmware and xArm Studio version of your xArm Controller is later than 1.3.0 If the Firmware and xArm Studio version is no later than 1.3.0, please upgrade the Firmware and xArm studio to the latest version according to the xArm user manual, or you can download xarm-tool-gui to do Firmware and xArm Studio upgrade, download link：https://drive.google.com/open?id=1zhWkVTCdJYv2eMCrhY6wNc82jYXnXOMB
(1) Change the date/time of your PC to a date of 10 years ago like Feb 19th 2010.
(2) Run xArm Studio and click “settings”-“timed task”, click the “Calibration” button.
(3) You will find the “System date time” one the page is changed to the date you set. Then restart the xArm Controller by the main power button on the xArm Controller.
(4) Recover the date and time settings of your PC.
Note: This operation will disable the “timed task” function.