Could not read RRD file

rrdcachedhandle_request_update: Could not read RRD file.PRIORITY3SYSLOG_FACILITY3SYSLOG_IDENTIFIERrrdcachedSYSLOG_PID1921SYSLOG_TIMESTAMPOct  3 17:11:08 _BOOT_IDec4003e509cc4e1c894b631471bfaf0d_CAP_EFFECTIVE3fffffffff_CMDLINE/usr/bin/rrdcached -B -F -f 3600 -w 900 -b /var/lib/rrdcached/db/ -j /var/lib/rrdcached/journal/ -p /run/rrdcached.pid -l unix:/run/rrdcached.sock_COMMrrdcached_EXE/usr/bin/rrdcached_GID0_HOSTNAMECSL-OMV.fritz.box_MACHINE_ID9b6e405adaa54d63b8d2f5324a21c098_PID1921_SELINUX_CONTEXTunconfined_SOURCE_REALTIME_TIMESTAMP1601737868731988_SYSTEMD_CGROUP/system.slice/rrdcached.service_SYSTEMD_INVOCATION_ID867bdd54b52b4311bbc57a9cf76e4f1b_SYSTEMD_SLICEsystem.slice_SYSTEMD_UNITrrdcached.service_TRANSPORTsyslog_UID0__CURSORs=33c63c695c874f9da07ced37749ac1ec;i=10f7fe6;b=ec4003e509cc4e1c894b631471bfaf0d;m=12b585ca7b6;t=5b0c5a8b06f02;x=e6d683f2b5fd011f__MONOTONIC_TIMESTAMP1285677688758__REALTIME_TIMESTAMP1601737868734210