You may see such error message in error_log or webadmin console.

[1857689] [config:server:epsr:lsphp54] invalid path - /opt/cpanel/ea-php54/root/usr/bin/lsphp, it cannot be started by Web server!
[1857689] [config:server:epsr:lsphp55] invalid path - /opt/cpanel/ea-php55/root/usr/bin/lsphp, it cannot be started by Web server!
[1857689] [config:server:epsr:lsphp56] invalid path - /opt/cpanel/ea-php56/root/usr/bin/lsphp, it cannot be started by Web server!
[1857689] [config:server:epsr:lsphp70] invalid path - /opt/cpanel/ea-php70/root/usr/bin/lsphp, it cannot be started by Web server!
[1857689] [config:scripthandler] Can not find handler with type: 17, name: lsphp54.
[1857689] [config:scripthandler] Can not find External Application: lsphp54, type: lsapi
[1857689] [config:scripthandler] use static file handler for suffix [php54]
[1857689] [config:scripthandler] Can not find handler with type: 17, name: lsphp55.
[1857689] [config:scripthandler] Can not find External Application: lsphp55, type: lsapi
[1857689] [config:scripthandler] use static file handler for suffix [php55]
[1857689] [config:scripthandler] Can not find handler with type: 17, name: lsphp56.
[1857689] [config:scripthandler] Can not find External Application: lsphp56, type: lsapi
[1857689] [config:scripthandler] use static file handler for suffix [php56]
[1857689] [config:scripthandler] Can not find handler with type: 17, name: lsphp70.
[1857689] [config:scripthandler] Can not find External Application: lsphp70, type: lsapi
[1857689] [config:scripthandler] use static file handler for suffix [php70]

The cause of this is when LSWS starts , and with default setting , it will scan the available PHP binaries.

and by default cPanel/WHM does not install ea-php54 to ea-php70 , which leads to LSWS unable to find those files, therefore throw up error.

This error is safely to ignore, once you install such PHP version in WHM , this message will be gone.

Or you can also disable auto-detection (not recommended) and manually configure the external-app to avoid this error message.