HI thompanilla,
Thank you for your purchase.

Can you please tell me are there any errors in the server log.

Best regards.

Hi thompanilla,

It looks like this are just some warrnings

Ok, first in file  ../wp-content/plugins/wpdatatables/templates/admin/table-settings/add_column_modal.inc.php find this line of code

<?php foreach ($tableData->table->columns as $column) { ?>  
  <option value="<?php echo $column->orig_header; ?>">
<?php echo $column->display_header; ?></option>
<?php } ?>

and add some changes to look like this

<?php if (is_object($tableData)){
foreach ($tableData->table->columns as $column) { ?>
<option value="<?php echo $column->orig_header; ?>"><?php echo $column--->display_header; ?></option>
<?php }} ?>

Then in file  ../wp-content/plugins/wpdatatables/templates/admin/table-settings/remove_column_modal.inc.php find this line of code

<?php foreach ($tableData->table->columns as $column) { ?>    <?php if ($column->orig_header == 'wdt_ID') {        continue;    } ?>    <option value="<?php echo $column->orig_header; ?>"><?php echo $column->display_header; ?></option>
<?php } ?>

and change it to look like this

<?php if (is_object($tableData)){
foreach ($tableData->table->columns as $column) { ?>
<?php if ($column--->orig_header == 'wdt_ID') {
continue;
} ?>
<option value="<?php echo $column->orig_header; ?>"><?php echo $column--->display_header; ?></option>
<?php }} ?>

Just add IF condition in both of those files which gave you a warnings.

Best regards.