You included the snippet swatch.liquid with the name of a product option — '' — that does not belong to your product.
''
Use {% include 'shirtpopswatchsize' with 'name of your product option here' %}
{% include 'shirtpopswatchsize' with 'name of your product option here' %}
Example: {% include 'shirtpopswatchsize' with 'Color' %}
{% include 'shirtpopswatchsize' with 'Color' %}
This is case-sensitive! Do not put in 'color' if your product option name is 'Color'.
'color'
'Color'
An over the door wreath hanger for displaying wreaths and swags on doors. Choose rubbed bronze or clear.
12" long
Dimensions: 27.5" Tall x 23" wide