Why "failed to open stream" error?

Question

I am integrating Zaincash module in magento. I am using this git. Module is installed and coming in admin->system->configuration->advanced but when accessing payment methods in admin its throwing HTTP ERROR 500.

When I looked into system.log file it has following errors:

2017-07-10T05:09:45+00:00 ERR (3): Warning: include(Mage/Zcash/Helper/Data.php): failed to open stream: No such file or directory in /var/www/mysite/lib/Varien/Autoload.php on line 94

2017-07-10T05:09:45+00:00 ERR (3): Warning: include(Mage/Zcash/Helper/Data.php): failed to open stream: No such file or directory in /var/www/mysite/lib/Varien/Autoload.php on line 94

2017-07-10T05:09:45+00:00 ERR (3): Warning: include(): Failed opening 'Mage/Zcash/Helper/Data.php' for inclusion (include_path='/var/www/mysite/app/code/local:/var/www/mysite/app/code/community:/var/www/mysite/app/code/core:/var/wwwmysite/lib:.:/usr/share/php:/usr/share/pear') in /var/www/mysite/lib/Varien/Autoload.php on line 94

Module was installed in app/code/local/WTC/Zcash.

Answer 1

open file

app/code/local/WTC/Zcash/etc/system.xml

Line No : 27 , replace module="Zcash" with below

module="zcash"

comment below code, line no : 79 to 87

<!--<mode translate="label">
                            <label>Transaction Mode</label>
                            <frontend_type>select</frontend_type>
                            <source_model>adminhtml/system_config_source_mode</source_model>
                            <sort_order>15</sort_order>
                            <show_in_default>1</show_in_default>
                            <show_in_website>1</show_in_website>
                            <show_in_store>0</show_in_store>
                        </mode>-->