The theme options can't be saved from Dashboard

Hi,

After I installed the new theme to my WordPress site, after I save the changes about theme options, it can't be saved, the error log like below:

[Fri Oct 12 21:56:35.059795 2018] [:error] [pid 32629] [client 10.55.145.9:63367] PHP Warning:  Missing argument 3 for MFN_Options_sliderbar::__construct(), called in /data/www/html/wp-content/themes/betheme/muffin-options/options.php on line 203 and defined in /data/www/html/wp-content/themes/betheme/muffin-options/fields/sliderbar/field_sliderbar.php on line 8, referer: https://uat.synnexcorp.com/wca/wp-admin/admin.php?page=be-options

Would you please help me to check this issue? thanks.

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