Error occurring: 500 Internal server error

[Tomomi]

I have the Shib 3.4.4 Idp installed on a Server Cent OS 7.5. 
Setup is complete and the status is normal.
Command that confirmed the status is below;
wget -O - http://localhost/idp/status

After that, I verified the operation on the test site.
Use test site is below;
https://sptest.iamshowcase.com/instructions#start

I get an error Internal server error.

There is no log at all.
/opt/shibboleth-idp/logs
/usr/share/tomcat/logs

Please give me some tips on what to do.
My English isn't so good so feel free to ask me if there is anything
unclear.

Regards,




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