I imported following code .
[{"id":"c4ed7b7f.b766a8","type":"ui_chart","z":"c1f54225.8011f","d":true,"name":"","group":"bb260e6b.77d62","order":8,"width":"9","height":"10","label":"Arduino YL-69 + v1.2 data","chartType":"line","legend":"true","xformat":"HH:mm:ss","interpolate":"bezier","nodata":"","dot":false,"ymin":"0","ymax":"1023","removeOlder":"60","removeOlderPoints":"","removeOlderUnit":"60","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"outputs":1,"x":1130,"y":620,"wires":[]},{"id":"bb260e6b.77d62","type":"ui_group","z":"3639e7d1.f1c3e8","name":"Capteurs d'humidité - Moisture sensors","tab":"","order":1,"disp":true,"width":"9","collapse":false}]
Then I deployed it and found that it is working ..
But after that I cannot delete the node and deploy .
Tested in windows and Linux .
Please let me know what is going wrong .