veeam backup 8 backup error "microsoft SQL server hosting the configuration database is currently unavailable

I'm receiving below error when using veeam backup 8 , any idea how to fix that ?

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David Johnson, CD, MVPOwnerCommented:
Is this a new or previously running installation?
in your veam configuration check the sql server properties.  Check the sql logs for errors. The sql service may not be running or if using sql express it may have grown too large.

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piaakitAuthor Commented:
this veeam is new install, would you mind to tell me which area in veeam I can check the sql logs ? as i'm using the express version by default during the veeam installation, thanks !
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