error trying to access backend - Forum | JoomShaper
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error trying to access backend

Asked by cmfionline 4 years ago Last activity 4 years ago

Hello,
I am geting this error when i try to access the backend (https://ztfomum.org/administrator/) of my website. The frontend (https://ztfomum.org) shows well.

Error: Call to undefined method Joomla\CMS\Document\ErrorDocument::getWebAssetManager(): Call to undefined method Joomla\CMS\Document\HtmlDocument::getWebAssetManager()

Please need help

2 replies

Oldest first Newest first Most helpful
Toufiq Senior Staff
4 years ago

Hi there,

Thanks for contacting us. Sorry for the inconvenience. Will you please provide me your site backup or provide me the Joomla administrator access and cpanel access. I will check & get back to you soon.

-Thanks

Paul Frankowski Senior Staff
4 years ago · edited

Hi,
I found similar topics on offcial Joomla Forum, one of them them:
https://forum.joomla.org/viewtopic.php?t=988978

second tip: https://www.minitek.gr/support/forum/joomla/minitek-wall/error-call-to-undefined-method-joomla-cms-document-htmldocument-getwebassetmanager?tab=recent

In most cases it's caused by extra plugin that is not Joomla 4 ready or on J3 you installed extension for Joomla 4 ! So it doesn't have to be our falut (bug/issue) as you may think.

Probably you have to recover website from backup and check all extensions (one by one) before upgrade. Your hosting provider should have backup, in case you don't have it.

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