Due to variations in fonts, Easel does not currently support importing SVG text elements. However, you can still import your custom text with a custom font, you just need to follow these steps:
Adobe Illustrator
Select all objects and select Object -> Expand
Inkscape
Select all objects and use the keyboard command Ctrl+Shift+C
Other programs
You need to convert your text into paths, which means making it un-editable as text. If there is an equivalent to 'Create Outlines' or 'Expand', that is what you are looking for.