Require help with Invoice Generation

Not sure what to do…..

Error Message Undefined index: unit_price
Error Number 8
Error File /home1/abagino/public_html/wp-content/plugins/woo-pdf-invoice-builder/htmlgenerator/fields/PDFTable.php
Error Line 537
Error Context {“i”:3,”type”:”unit_price”,”column”:{“type”:”unit_price”,”header”:”Unit price”,”width”:”15%”,”additionalProperties”:{},”customProperties”:{}}}
Error Detail file:/home1/abagino/public_html/wp-content/plugins/woo-pdf-invoice-builder/htmlgenerator/fields/PDFTable.php
line:537
function:CatchShutdownHandler
class:RednaoWooCommercePDFInvoiceAjax
object:[object Object]
type:->
args:8,Undefined index: unit_price,/home1/abagino/public_html/wp-content/plugins/woo-pdf-invoice-builder/htmlgenerator/fields/PDFTable.php,537,[object Object]

file:/home1/abagino/public_html/wp-content/plugins/woo-pdf-invoice-builder/htmlgenerator/fields/PDFTable.php
line:92
function:GetDetailValue
class:rnwcinv\htmlgenerator\fields\PDFTable
object:[object Object]
type:->
args:3,unit_price,[object Object]

file:/home1/abagino/public_html/wp-content/plugins/woo-pdf-invoice-builder/htmlgenerator/fields/PDFTable.php
line:636
function:CreateDetailRows
class:rnwcinv\htmlgenerator\fields\PDFTable
object:[object Object]
type:->
args:[object Object],[object Object],[object Object],[object Object],[object Object]

file:/home1/abagino/public_html/wp-content/plugins/woo-pdf-invoice-builder/htmlgenerator/fields/PDFFieldBase.php
line:101
function:InternalGetHTML
class:rnwcinv\htmlgenerator\fields\PDFTable
object:[object Object]
type:->
args:

file:/home1/abagino/public_html/wp-content/plugins/woo-pdf-invoice-builder/htmlgenerator/AreaGenerator.php
line:48
function:GetHTML
class:rnwcinv\htmlgenerator\fields\PDFFieldBase
object:[object Object]
type:->
args:

file:/home1/abagino/public_html/wp-content/plugins/woo-pdf-invoice-builder/htmlgenerator/PageGenerator.php
line:61
function:Generate
class:rnwcinv\htmlgenerator\AreaGenerator
object:[object Object]
type:->
args:

file:/home1/abagino/public_html/wp-content/plugins/woo-pdf-invoice-builder/htmlgenerator/PageGenerator.php
line:38
function:GenerateArea
class:rnwcinv\htmlgenerator\PageGenerator
object:[object Object]
type:->
args:[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

file:/home1/abagino/public_html/wp-content/plugins/woo-pdf-invoice-builder/htmlgenerator/DocumentGenerator.php
line:80
function:Generate
class:rnwcinv\htmlgenerator\PageGenerator
object:[object Object]
type:->
args:

file:/home1/abagino/public_html/wp-content/plugins/woo-pdf-invoice-builder/PDFGenerator.php
line:319
function:Generate
class:rnwcinv\htmlgenerator\DocumentGenerator
object:[object Object]
type:->
args:

file:/home1/abagino/public_html/wp-content/plugins/woo-pdf-invoice-builder/PDFGenerator.php
line:265
function:Generate
class:RednaoPDFGenerator
object:[object Object]
type:->
args:false

file:/home1/abagino/public_html/wp-content/plugins/woo-pdf-invoice-builder/woocommerce-pdf-invoice-ajax.php
line:552
function:GeneratePreview
class:RednaoPDFGenerator
object:[object Object]
type:->
args:

file:/home1/abagino/public_html/wp-includes/class-wp-hook.php
line:287
function:DiagnoseError
class:RednaoWooCommercePDFInvoiceAjax
object:[object Object]
type:->
args:

file:/home1/abagino/public_html/wp-includes/class-wp-hook.php
line:311
function:apply_filters
class:WP_Hook
object:[object Object]
type:->
args:,

file:/home1/abagino/public_html/wp-includes/plugin.php
line:478
function:do_action
class:WP_Hook
object:[object Object]
type:->
args:

file:/home1/abagino/public_html/wp-admin/admin-ajax.php
line:176
function:do_action
args:wp_ajax_rednao_wcpdfinv_diagnose_error