How do I get a lepton image?

I'm using Ubuntu 20.04 lts version.
'GetThermal-v0.1.4-x86_64-Linux.AppImage'
I downloaded it.
Then './ Get Thermal-v0.1.4-x86_64-Linux.I entered the 'AppImage' code.

Then an error occurs as follows.

UVC initialized
Device found
uvc_open: Access denied (-3)
Surface set. Supported formats: 18 19 22 23 20 21 3 1 10 8 5
qrc:/controls/CameraControls.qml:56: TypeError: Cannot read property 'objectName' of null
Surface supports format 0 width -1 height -1qrc:/ViewerForm.ui.qml:53: TypeError: Cannot read property 'supportsRadiometry' of null
qrc:/ViewerForm.ui.qml:68: TypeError: Cannot read property 'supportsRadiometry' of null
qrc:/controls/SpotInfo.qml:11: TypeError: Cannot read property 'radTLinearResolution' of null
qrc:/controls/SpotInfo.qml:46: TypeError: Cannot read property 'radSpotmeterInKelvinX100' of null
qrc:/controls/RangeDisplay.qml:11: TypeError: Cannot read property 'radTLinearResolution' of null

What should I do

[joedavidbuilds]

have you tried with starting the command with "sudo"?