The full error message should include the line number and filename...

Whoops\Exception\ErrorException thrown with message "Division by zero"

Stacktrace:
#34 Whoops\Exception\ErrorException in /home/.sites/98/site9517936/web/packages/easy_image_gallery/blocks/easy_image_gallery/controller.php:375
#33 Whoops\Run:handleError in /home/.sites/98/site9517936/web/packages/easy_image_gallery/blocks/easy_image_gallery/controller.php:375
#32 Concrete\Package\EasyImageGallery\Block\EasyImageGallery\Controller:generatePlaceHolderFromArray in /home/.sites/98/site9517936/web/packages/easy_image_gallery/blocks/easy_image_gallery/controller.php:173
#31 Concrete\Package\EasyImageGallery\Block\EasyImageGallery\Controller:view in /home/.sites/98/site9517936/web/concrete/src/Controller/AbstractController.php:315
#30 call_user_func_array in /home/.sites/98/site9517936/web/concrete/src/Controller/AbstractController.php:315
#29 Concrete\Core\Controller\AbstractController:runAction in /home/.sites/98/site9517936/web/concrete/src/Block/View/BlockView.php:446
#28 Concrete\Core\Block\View\BlockView:runControllerTask in /home/.sites/98/site9517936/web/concrete/src/Block/View/BlockView.php:119
#27 Concrete\Core\Block\View\BlockView:setupRender in /home/.sites/98/site9517936/web/concrete/src/View/AbstractView.php:161
#26 Concrete\Core\View\AbstractView:render in /home/.sites/98/site9517936/web/concrete/src/Area/Area.php:853
#25 Concrete\Core\Area\Area:display in /home/.sites/98/site9517936/web/concrete/themes/elemental/default.php:11
#24 include in /home/.sites/98/site9517936/web/concrete/src/View/View.php:109
#23 Concrete\Core\View\View:inc in /home/.sites/98/site9517936/web/concrete/themes/elemental/full.php:4
#22 include in /home/.sites/98/site9517936/web/concrete/src/View/View.php:288
#21 Concrete\Core\View\View:renderTemplate in /home/.sites/98/site9517936/web/concrete/src/View/View.php:250
#20 Concrete\Core\View\View:renderViewContents in /home/.sites/98/site9517936/web/concrete/src/View/AbstractView.php:164
#19 Concrete\Core\View\AbstractView:render in /home/.sites/98/site9517936/web/concrete/src/Http/ResponseFactory.php:149
#18 Concrete\Core\Http\ResponseFactory:view in /home/.sites/98/site9517936/web/concrete/src/Http/ResponseFactory.php:216
#17 Concrete\Core\Http\ResponseFactory:controller in /home/.sites/98/site9517936/web/concrete/src/Http/ResponseFactory.php:367
#16 Concrete\Core\Http\ResponseFactory:collection in /home/.sites/98/site9517936/web/concrete/src/Http/DefaultDispatcher.php:131
#15 Concrete\Core\Http\DefaultDispatcher:handleDispatch in /home/.sites/98/site9517936/web/concrete/src/Http/DefaultDispatcher.php:59
#14 Concrete\Core\Http\DefaultDispatcher:dispatch in /home/.sites/98/site9517936/web/concrete/src/Http/Middleware/DispatcherDelegate.php:39
#13 Concrete\Core\Http\Middleware\DispatcherDelegate:next in /home/.sites/98/site9517936/web/concrete/src/Http/Middleware/ThumbnailMiddleware.php:76
#12 Concrete\Core\Http\Middleware\ThumbnailMiddleware:process in /home/.sites/98/site9517936/web/concrete/src/Http/Middleware/MiddlewareDelegate.php:50
#11 Concrete\Core\Http\Middleware\MiddlewareDelegate:next in /home/.sites/98/site9517936/web/concrete/src/Http/Middleware/FrameOptionsMiddleware.php:39
#10 Concrete\Core\Http\Middleware\FrameOptionsMiddleware:process in /home/.sites/98/site9517936/web/concrete/src/Http/Middleware/MiddlewareDelegate.php:50
#9 Concrete\Core\Http\Middleware\MiddlewareDelegate:next in /home/.sites/98/site9517936/web/concrete/src/Http/Middleware/CookieMiddleware.php:35
#8 Concrete\Core\Http\Middleware\CookieMiddleware:process in /home/.sites/98/site9517936/web/concrete/src/Http/Middleware/MiddlewareDelegate.php:50
#7 Concrete\Core\Http\Middleware\MiddlewareDelegate:next in /home/.sites/98/site9517936/web/concrete/src/Http/Middleware/ApplicationMiddleware.php:29
#6 Concrete\Core\Http\Middleware\ApplicationMiddleware:process in /home/.sites/98/site9517936/web/concrete/src/Http/Middleware/MiddlewareDelegate.php:50
#5 Concrete\Core\Http\Middleware\MiddlewareDelegate:next in /home/.sites/98/site9517936/web/concrete/src/Http/Middleware/MiddlewareStack.php:86
#4 Concrete\Core\Http\Middleware\MiddlewareStack:process in /home/.sites/98/site9517936/web/concrete/src/Http/DefaultServer.php:85
#3 Concrete\Core\Http\DefaultServer:handleRequest in /home/.sites/98/site9517936/web/concrete/src/Foundation/Runtime/Run/DefaultRunner.php:128
#2 Concrete\Core\Foundation\Runtime\Run\DefaultRunner:run in /home/.sites/98/site9517936/web/concrete/src/Foundation/Runtime/DefaultRuntime.php:102
#1 Concrete\Core\Foundation\Runtime\DefaultRuntime:run in /home/.sites/98/site9517936/web/concrete/dispatcher.php:45
#0 require in /home/.sites/98/site9517936/web/index.php:3

# concrete5 Version
Core Version - 8.5.5
Version Installed - 8.5.5
Database Version - 20201116182100

# Database Information
Version: 5.7.31-log
SQL Mode: STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION

# concrete5 Packages
Call to Action (1.0.0), Easy Image Gallery (1.4.2), Honest Websites Back To Top (1.1.0), Poptin (0.9.9), Styled Maps (1.2.3)

# concrete5 Overrides
None

# concrete5 Cache Settings
Block Cache - On
Overrides Cache - On
Full Page Caching - Off
Full Page Cache Lifetime - Every 6 hours (default setting).

# Server Software
Apache

# Server API
cgi-fcgi

# PHP Version
7.3.27

# PHP Extensions
bcmath, calendar, cgi-fcgi, Core, ctype, curl, date, dom, exif, fileinfo, filter, ftp, gd, gettext, hash, iconv, imap, intl, json, libxml, mbstring, mysqli, mysqlnd, openssl, pcre, PDO, pdo_mysql, pdo_sqlite, Phar, posix, Reflection, session, SimpleXML, soap, sockets, SPL, sqlite3, standard, tokenizer, xml, xmlreader, xmlrpc, xmlwriter, xsl, zip, zlib

# PHP Settings
max_execution_time - 30
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 60
max_input_vars - 1500
memory_limit - 128M
post_max_size - 200M
upload_max_filesize - 200M
mbstring.regex_stack_limit - 100000
mysqli.max_links - Unlimited
mysqli.max_persistent - 0
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
session.cache_limiter - <i>no value</i>
session.gc_maxlifetime - 7200
soap.wsdl_cache_limit - 5

Hi,

Apparently height and width attributes are not available anymore after the C5 upgrade.
This addon will rescan all files:https://www.concrete5.org/marketplace/addons/rescan-all-files...

And then follow the steps mentioned inhttps://www.concrete5.org/marketplace/addons/easy-image-gallery/supp... and it'll work

And don't forget to do this too:https://www.concrete5.org/community/forums/usage/concrete5-8.5.2-eas...