The value cannot be displayed on sikscreen

3DOK,but value can not displayed in GERBER

What version of KiCad do you use? (About dialog)

Please check the settings in the gerber export dialog
grafik

!? There are text and lines in the solder mask. Intended?

Click MAK to display information eg .gnd,+5V,+3.3V…

You have the values on the SolderMask layer not the Silkscreen layer, change them to the Silkscreen layer . . .

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