- while doing my upgrade i found these error during the upgrade
Unable to require /hermes/bosnaweb10a/b1154/nf.chinnkocom/public_html/chinnko/sys//JsonSerializable.php Fatal error: Interface 'JsonSerializable' not found in /hermes/bosnaweb10a/b1154/nf.chinnkocom/public_html/chinnko/sys/vendor/illuminate/support/Illuminate/Support/Collection.php on line 13
i had to download the codofurm manually to install but i cant find these
JsonSerializable.php
when i click on All Topics , it does not drop down my category, is not working

When you click on a particular topics which will carry you to the category to read a topic, you see a bold image like these before the exact topics is shown bellow

if i login into my admin and click o page i see a fatal error,

Note : Please need an urgent attention on topic raise
1. while doing my upgrade i found these error during the upgrade
Unable to require /hermes/bosnaweb10a/b1154/nf.chinnkocom/public_html/chinnko/sys//JsonSerializable.php Fatal error: Interface 'JsonSerializable' not found in /hermes/bosnaweb10a/b1154/nf.chinnkocom/public_html/chinnko/sys/vendor/illuminate/support/Illuminate/Support/Collection.php on line 13
i had to download the codofurm manually to install but i cant find these
JsonSerializable.php
2. when i click on All Topics , it does not drop down my category, is not working 
3. When you click on a particular topics which will carry you to the category to read a topic, you see a bold image like these before the exact topics is shown bellow 
4. if i login into my admin and click o page i see a fatal error,

Note : Please need an urgent attention on topic raise