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I get the error exception 'Mage_Core_Exception' with message 'Invalid block type: ' so no block is mentioned. Home is not loaded properly however. So kind of hard to debug this way. Complete trace is

2017-02-04T12:50:35+00:00 ERR (3): 
exception 'Mage_Core_Exception' with message 'Invalid block type: ' in /home/user/prelaunch.domain.com/app/Mage.php:595
Stack trace:
#0 /home/user/prelaunch.domain.com/app/code/core/Mage/Core/Model/Layout.php(495): Mage::throwException('Invalid block t...')
#1 /home/user/prelaunch.domain.com/app/code/core/Mage/Core/Model/Layout.php(437): Mage_Core_Model_Layout->_getBlockInstance('', Array)
#2 /home/user/prelaunch.domain.com/app/code/core/Mage/Core/Model/Layout.php(472): Mage_Core_Model_Layout->createBlock('', 'content')
#3 /home/user/prelaunch.domain.com/app/code/core/Mage/Core/Model/Layout.php(239): Mage_Core_Model_Layout->addBlock('', 'content')
#4 /home/user/prelaunch.domain.com/app/code/core/Mage/Core/Model/Layout.php(205): Mage_Core_Model_Layout->_generateBlock(Object(Mage_Core_Model_Layout_Element), Object(Mage_Core_Model_Layout_Element))
#5 /home/user/prelaunch.domain.com/app/code/core/Mage/Core/Controller/Varien/Action.php(344): Mage_Core_Model_Layout->generateBlocks()
#6 /home/user/prelaunch.domain.com/app/code/core/Mage/Core/Controller/Varien/Action.php(269): Mage_Core_Controller_Varien_Action->generateLayoutBlocks()
#7 /home/user/prelaunch.domain.com/app/code/core/Mage/Adminhtml/Controller/Action.php(275): Mage_Core_Controller_Varien_Action->loadLayout(NULL, true, true)
#8 /home/user/prelaunch.domain.com/app/code/local/Magestore/Megamenu/controllers/Adminhtml/MegamenuController.php(472): Mage_Adminhtml_Controller_Action->loadLayout()
#9 /home/user/prelaunch.domain.com/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Magestore_Megamenu_Adminhtml_MegamenuController->cacheAction()
#10 /home/user/prelaunch.domain.com/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('cache')
#11 /home/user/prelaunch.domain.com/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#12 /home/user/prelaunch.domain.com/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
#13 /home/user/prelaunch.domain.com/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#14 /home/user/prelaunch.domain.com/index.php(88): Mage::run('', 'store')
#15 {main}

Regular error log only reports an error from earlier on:

[Sat Feb 04 05:00:26 2017] [error] [client xx.xxx.xxx.xxx] File does not exist: /home/user/prelaunch.domain.com/js/lr_callprice/jquery.min.map

Any ideas how I can debug this properly?

4

As in the answer by alan storm, the issue is related to a block where you have not added a type for a block. e.g.

<block name="checkout.cart">

Where in your case, it seems something like this,

<block name="content">

When you find above code, Update it with

<reference name="content">

and complete <reference> tag instead of <block> tag.

I have a search script which can be useful for finding this error in your code,
Once you add search.php file in your magento root folder, run it like yordomain.com/search.php search for <block name="content"> keyword in xml files.
You will find the file which needs to be updated.

  • Did a grep -rnw 'app/' -e "<block name=" and found 16 instances of <block name=. See gist.github.com/jasperf/3c3e1fa75eadbb869b2e29f221e28354 . So should I replace all by reference name? Perhaps just the <block name="content"> in app/design/adminhtml/default/default/layout/megamenu.xml:127: , no? – rhand Feb 4 '17 at 15:49
  • Yes, @rhand, you are right, there is only one block which does not have a type attribute. Update that file, the error should be gone. – Neha Raval Feb 4 '17 at 15:53
  • Well, did that. Now megamenu cache is no longer working and the homepage is still blank though. Not even getting decent errors but File does not exist: /home/user/prelaunch.domain.com/js/lr_callprice/jquery.min.map – rhand Feb 4 '17 at 16:14
  • can you share your app/design/adminhtml/default/default/layout/megamenu.xml file? – Neha Raval Feb 4 '17 at 16:17
  • 1
    update in your file app/design/adminhtml/default/default/layout/megamenu.xml, Please replace <block type="content"><block type="megamenu/adminhtml_cache" name="megamenu.cache" template="megamenu/cache.phtml" /> </block> with <reference name="content"><block type="megamenu/adminhtml_cache" name="megamenu.cache" template="megamenu/cache.phtml" /> </reference> – Neha Raval Feb 4 '17 at 16:38

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