theme casual changing colors

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I am installing my second site with concrete5.8 and the casual theme.
Now when i am trying to change colors i get an error (see attachment).
It means I can't change colors in the way I would, so please help!

In the first site (kk4) i managed to change the colors and i can't find where the difference is coming from.
I had to zip the htm file.
The system resist sending it as a htm

1 Attachment

Type: Pre-Sale
Status: New
kort47
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concrete5 Environment Information

# concrete5 Version
Core Version - 8.5.4
Version Installed - 8.5.4
Database Version - 20200609145307

# Database Information
Version: 10.4.17-MariaDB-log-cll-lve
SQL Mode: NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

# concrete5 Packages
Casual (1.1.7), List Files From Set (1.1), Simple Gallery (1.0.9)

# 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
litespeed

# PHP Version
7.3.27

# PHP Extensions
bz2, calendar, Core, ctype, curl, date, dom, exif, fileinfo, filter, ftp, gd, gettext, gmp, hash, iconv, imap, intl, ionCube Loader, json, libxml, litespeed, mbstring, mcrypt, mysqli, mysqlnd, OAuth, openssl, pcntl, pcre, PDO, pdo_mysql, pdo_sqlite, Phar, posix, readline, redis, Reflection, session, shmop, SimpleXML, soap, sockets, sodium, SPL, sqlite3, standard, tokenizer, uploadprogress, xml, xmlreader, xmlrpc, xmlwriter, xsl, Zend OPcache, 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 - 96M
post_max_size - 32M
upload_max_filesize - 32M
ic24.api.max_timeout - 7
mbstring.regex_stack_limit - 100000
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
redis.pconnect.connection_limit - 0
session.cache_limiter - <i>no value</i>
session.gc_maxlifetime - 7200
soap.wsdl_cache_limit - 5
opcache.max_accelerated_files - 10000
opcache.max_file_size - 0
opcache.max_wasted_percentage - 5

Browser User-Agent String

Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:86.0) Gecko/20100101 Firefox/86.0

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