Couldn’t verify test file contents after Update to 2.0.16

Hello,

updated to 2.0.16 and get now Couldn’t verify test file contents.

Status: Connected
Client: PhpRedis (v5.3.2)
Drop-in: Valid
Disabled: No
Filesystem: Couldn’t verify test file contents.
Ping: 1
Errors: []
PhpRedis: 5.3.2
Predis: Not loaded
Credis: Not loaded
PHP Version: 7.4.13
Plugin Version: 2.0.16
Redis Version: 6.0.9
Multisite: No
Global Prefix: “ws_”
Blog Prefix: “ws_”
WP_REDIS_SCHEME: “unix”
WP_REDIS_PATH: “/var/run/redis/redis.sock”
WP_REDIS_DATABASE: 4
WP_REDIS_PREFIX: “rtle”
WP_CACHE_KEY_SALT: “rtle”
WP_REDIS_PASSWORD: ????
Global Groups: [
“blog-details”,
“blog-id-cache”,
“blog-lookup”,
“global-posts”,
“networks”,
“rss”,
“sites”,
“site-details”,
“site-lookup”,
“site-options”,
“site-transient”,
“users”,
“useremail”,
“userlogins”,
“usermeta”,
“user_meta”,
“userslugs”,
“redis-cache”,
“blog_meta”
]
Ignored Groups: [
“counts”,
“plugins”,
“themes”
]
Unflushable Groups: []
Drop-ins: [
“advanced-cache.php v by “,
“Redis Object Cache Drop-In v2.0.15 by Till Krüss”
]

How to fix ?

best regards
Thx
Sally