I have migrate my Cakephp 3.4(running on php version 5.6.36) from one server to other

on First server website is running proper but on new server its making problems

It seems that the machine the composer files were created on did run on PHP 7 but the current server is 5.6.

Find a package version for eluceo/ical that is compatible with PHP 5.6 and require that in composer.

Here you can view that the required version is same as in composer.json

Yes, this package’s version 0.13.0 requires PHP 7.0+. You have to find a (lower) version that works with PHP 5.6 and require that in composer.json.

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Thanks @Schlaefer it worked for me