Error message when selecting file in textarea

@distantnative Your wish is my command… nothing fancy…

type:                  group
fields:
  contentbuilder:
    label: Page Blocks
    type: builder
    columns: 1
    max: 99
    fieldsets:

      # Content
      basiccontent:
        label: Basic Content
        extends: blocks/content

      # + More Fieldsets that are not relevant. 

All the content block has in it is this…

type:      group
fields:
  text:
    label: Text
    type:  textarea
    size:  large