In Magento 2.2.2, clicking of custom admin gives the this error.

How to fix it.


I Fixed the Issue. Issue is i added the space in as property:

<block class="Magento\Backend\Block\Widget\Grid\Column" as=" order_id"> 

Removed space before order_id property.

<block class="Magento\Backend\Block\Widget\Grid\Column" as="order_id"> 

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