The problem of service injection in angular

the service code is as follows

 StaticInjectorError(Platform: core)[FatherComponent -> InnerService]: 
    NullInjectorError: No provider for InnerService!
    at
Jan.21,2022

InnerService needs to be injected into, in:

providers: [ InnerService ]

did not put module into appModule's import

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e489bb-44cd8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e489bb-44cd8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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