Theme error on sales order

@lubos @Tut @Joe91

Hello, i have been getting this error (as attached) for the past few days. Am using POS theme to print out my sales order and sales invoice but its nomore working for me.

kindly suggest what i need to do ASAP. this has hindered our operation

Can you share the 4th line in your custom theme?

thank you for your prompt reply

<table style="background-color: #FFFFFF: width: 130px; color: #000000; text-transform: UPPERCASE\lowercase ;font-size:15px">
{% assign description = null %}
{% assign qty = null %}
{% assign unit price = null %}
{% assign amount = null %}

{% assign unit price = null %}

needs to be:

{% assign unit_price = null %}

Thank you @lubos .

it worked. i really appreciate your swift response