Magento frontend error stack

[albreemdinc4a0]

https://ibb.co/8rWtNxm 

Hello everyone, 

I need help to figure out this error please, I've been searching for 3 days until now and I tried many solutions and none solve it. 

I've changed few things in the headcust.phtml file which was just naming and all for some of the products and I tested it and the website was working just fine, then suddenly this message started to appear.

can anyone tell me what could be the reason or which file to add to make it work again please. Im still beginner in Magento. this is my first project

the link is having a screenshot of the stack**

Appreciate all the help

Thanks,

Dina

[hazelmarise4e0]

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@albreemdinc4a0 wrote:

https://ibb.co/8rWtNxm 

Hello everyone, MyLabCorp Portal

I need help to figure out this error please, I've been searching for 3 days until now and I tried many solutions and none solve it. 

I've changed few things in the headcust.phtml file which was just naming and all for some of the products and I tested it and the website was working just fine, then suddenly this message started to appear.

can anyone tell me what could be the reason or which file to add to make it work again please. Im still beginner in Magento. this is my first project

the link is having a screenshot of the stack**

Appreciate all the help

Thanks,

Dina

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Hello when I add an extension to Magento 2 my front-end disappears, but at the back end everything is fine and that extension is working.