Exception on expired certificate

On my Nextcloud instance I have an expired SSL certificate. In the news app I get this message: java.lang.ClassNotFoundException: com.owncloud.android.lib.common.net...

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App Version: 0.9.9.94
App Version Code: 195

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SSO enabled: true

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OS Version: 6.1.112-android14-11-gde436e940319-ab13241938(1770822901)
OS API Level: 35
Device: FP6
Model (and Product): Fairphone 6 (lineage_FP6)

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cb_detailed_view_zoom=true
sp_max_cache_size=500
sp_swipe_left_action=2
sw_use_single_sign_on=true
cb_ShowOnlyUnread=false
cb_openInBrowserDirectly=false
cb_prefBackButtonOpensDrawer=false
lv_cacheImagesOffline=1
cb_ShowFastActions=true
pref_sync_settings=60
cb_AutoSyncOnStart=true
sp_news_detail_actionbar_icons=[]
sp_swipe_right_action=2
cb_NavigateWithVolumeButtons=false
sp_font_size=1.0
NewsWebVersionNumber=25.2.1
sp_search_in=2
cb_external_player=false
cb_SyncWhenScrolledToBottom=false
sp_sort_order=1
cb_MarkAsReadWhileScrolling=false
sp_feed_list_layout=6
cb_oled_mode=true
PREVIOUS_VERSION_CODE=195
sp_display_browser=0
sp_app_theme=0