concrete5 Environment Information
# concrete5 Version
Core Version - 5.7.5.6
Version Installed - 5.7.5.6
Database Version - 20151221000000
# concrete5 Packages
Call to Action (1.0.0), Deluxe Customizable Twitter Feed (0.9.7), ExchangeCore Dev Tools (1.0.0), Fruitful (1.2), List files from set (1.0.10), Login/Logout Link (1.0), Login Block (0.9.3), PDF Viewer (1.0.1), Quick Tabs (1.0), Responsive Embed (1.0.0), Separator (0.9.3), Simple Slider (1.0), Spacer (0.9.3), Stupid Slider (0.9.1), Thumb Gallery (1.0.3), Tweet Feed Block Components (0.9.13), Vivid Simple Accordion (1.0.1).
# concrete5 Overrides
blocks/form/templates/victoria/view.css, blocks/form/templates/victoria/view.php, blocks/form/templates/victoria, blocks/form/templates, blocks/form, languages/sv_SE/LC_MESSAGES/messages.mo, languages/sv_SE/LC_MESSAGES, languages/sv_SE, languages/nl_NL/LC_MESSAGES/messages.mo, languages/nl_NL/LC_MESSAGES, languages/nl_NL, languages/it_IT/LC_MESSAGES/messages.mo, languages/it_IT/LC_MESSAGES, languages/it_IT, languages/ja_JP/LC_MESSAGES/messages.mo, languages/ja_JP/LC_MESSAGES, languages/ja_JP, languages/de_DE/LC_MESSAGES/messages.mo, languages/de_DE/LC_MESSAGES, languages/de_DE, languages/fr_FR/LC_MESSAGES/messages.mo, languages/fr_FR/LC_MESSAGES, languages/fr_FR, languages/sl_SI/LC_MESSAGES/messages.mo, languages/sl_SI/LC_MESSAGES, languages/sl_SI, languages/ru_RU/LC_MESSAGES/messages.mo, languages/ru_RU/LC_MESSAGES, languages/ru_RU, languages/da_DK/LC_MESSAGES/messages.mo, languages/da_DK/LC_MESSAGES, languages/da_DK, languages/fi_FI/LC_MESSAGES/messages.mo, languages/fi_FI/LC_MESSAGES, languages/fi_FI, languages/tr_TR/LC_MESSAGES/messages.mo, languages/tr_TR/LC_MESSAGES, languages/tr_TR, languages/el_GR/LC_MESSAGES/messages.mo, languages/el_GR/LC_MESSAGES, languages/el_GR, single_pages/login.php, blocks/form/templates/victoria/view.css, blocks/form/templates/victoria/view.php, blocks/form/templates/victoria, blocks/form/templates, blocks/form, languages/sv_SE/LC_MESSAGES/messages.mo, languages/sv_SE/LC_MESSAGES, languages/sv_SE, languages/nl_NL/LC_MESSAGES/messages.mo, languages/nl_NL/LC_MESSAGES, languages/nl_NL, languages/it_IT/LC_MESSAGES/messages.mo, languages/it_IT/LC_MESSAGES, languages/it_IT, languages/ja_JP/LC_MESSAGES/messages.mo, languages/ja_JP/LC_MESSAGES, languages/ja_JP, languages/de_DE/LC_MESSAGES/messages.mo, languages/de_DE/LC_MESSAGES, languages/de_DE, languages/fr_FR/LC_MESSAGES/messages.mo, languages/fr_FR/LC_MESSAGES, languages/fr_FR, languages/sl_SI/LC_MESSAGES/messages.mo, languages/sl_SI/LC_MESSAGES, languages/sl_SI, languages/ru_RU/LC_MESSAGES/messages.mo, languages/ru_RU/LC_MESSAGES, languages/ru_RU, languages/da_DK/LC_MESSAGES/messages.mo, languages/da_DK/LC_MESSAGES, languages/da_DK, languages/fi_FI/LC_MESSAGES/messages.mo, languages/fi_FI/LC_MESSAGES, languages/fi_FI, languages/tr_TR/LC_MESSAGES/messages.mo, languages/tr_TR/LC_MESSAGES, languages/tr_TR, languages/el_GR/LC_MESSAGES/messages.mo, languages/el_GR/LC_MESSAGES, languages/el_GR, single_pages/login.php
# concrete5 Cache Settings
Block Cache - On
Overrides Cache - On
Full Page Caching - On - If blocks on the particular page allow it.
Full Page Cache Lifetime - Every 1500 minutes.
# Server Software
Apache
# Server API
cgi-fcgi
# PHP Version
5.4.43
# PHP Extensions
bcmath, bz2, calendar, cgi-fcgi, Core, ctype, curl, date, dba, dom, enchant, ereg, exif, fileinfo, filter, ftp, gd, gettext, gmp, hash, iconv, imagick, imap, intl, json, ldap, libxml, mbstring, mcrypt, mhash, mysql, mysqli, odbc, openssl, pcntl, pcre, PDO, pdo_dblib, pdo_mysql, PDO_ODBC, pdo_pgsql, pdo_sqlite, pgsql, Phar, posix, pspell, readline, recode, Reflection, session, shmop, SimpleXML, soap, sockets, SPL, sqlite3, standard, sysvmsg, sysvsem, sysvshm, tidy, tokenizer, wddx, xml, xmlreader, xmlrpc, xmlwriter, xsl, Zend Guard Loader, 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 - 1000
memory_limit - 128M
post_max_size - 50M
sql.safe_mode - Off
upload_max_filesize - 50M
ldap.max_links - Unlimited
mysql.max_links - Unlimited
mysql.max_persistent - Unlimited
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
odbc.max_links - Unlimited
odbc.max_persistent - Unlimited
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
pgsql.max_links - Unlimited
pgsql.max_persistent - Unlimited
session.cache_limiter - <i>no value</i>
session.gc_maxlifetime - 1440
soap.wsdl_cache_limit - 5
What I think has happened is that you've deleted the file set, but you had it set to display the title of the set - this triggered this error, but it shouldn't have been able to even try to get the file set name at this point. Fortunately an easy to fix bug.
I've made an update to the package - try upgrading to version 1.0.12 and let me know if that fixes it for you when you return to the troublesome page.
-Ryan