Magento – Error after upgrade to Magento 2.2

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Getting this error. Please can anyone help us ?

1 exception(s):
Exception #0 (Magento\Framework\Config\Dom\ValidationException): Element 'block', attribute 'class': [facet 'pattern'] The value 'Ortho\Theme\Block\category\Leftcategory' is not accepted by the pattern '[A-Z][a-zA-Z\d](\[A-Z][a-zA-Z\d])*'.
Line: 798

Element 'block', attribute 'class': 'Ortho\Theme\Block\category\Leftcategory' is not a valid value of the atomic type 'blockClassType'.
Line: 798

Best Answer

Seems that this is happening because of the block class path, where the 'category' folder is written with lower case. Try to change it to 'Category'.

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