installation error for EV bike shop pro theme

Dear expert,

I kept getting the error msgs below when installing EV bike shop pro theme.
I tried to reinstall WP several times, still every time this happens to the new WP installation.
Please urgently help!
—–

Fatal error: Uncaught Error: Call to undefined function is_shop() in
/home/greattoshare/public_html/wp-content/themes/ev-bike-shop-pro/functions.php:54 Stack
trace: #0 /home/greattoshare/public_html/wp-includes/class-wp-hook.php(324):
ev_bike_shop_pro_scripts(‘ ‘) #1 /home/greattoshare/public_html/wp-includes/class-wphook.
php(348): WP _Hook->apply_filters(NULL, Array) #2 /home/greattoshare/public_html/wpincludes/
plugin.php(517): WP _Hook->do_action(Array) #3 /home/greattoshare/public_html/wpincludes/
script-loader.php(2265): do_action(‘wp_enqueue_scri. . .’) #4
/home/greattoshare/public_html/wp-includes/class-wp-hook.php(324): wp_enqueue_scripts(”)
#5 /home/greattoshare/public_html/wp-includes/class-wp-hook.php(348): WP _Hook>
apply_filters(NULL, Array) #6 /home/greattoshare/public_html/wp-includes/plugin.php(517):
WP _Hook->do_action (Array) #7 /home/g reattoshare/pu blic_htm I/wp-i ncl udes/genera Itemplate.
php ( 3050): do_action(‘wp_head’) #8 /home/greattoshare/public_html/wpcontent/
themes/ev-bike-shop-pro/header.php(17): wp_head () #9
/home/greattoshare/public_html/wp-includes/template.php(810):
requ i re_once ( ‘/home/g reattosh .. .’) #10 /home/g reattosha re/pu blic_htm l/wpi
ncl udes/template. php(745): load_template(‘/home/greattosh .. .’, true, Array) #11
/home/greattoshare/public_html/wp-includes/general-template.php(48): locate_template(Array,
true, true, Array) #12 /home/greattoshare/public_html/wp-content/themes/ev-bike-shoppro/
index.php(12): get_header() #13 /home/greattoshare/public_html/wp-includes/templateloader.
php(106): include(‘/home/greattosh .. .’) #14 /home/greattoshare/public_html/wp-blogheader.
php(19): require_once(‘/home/greattosh .. .’) #15
/home/greattoshare/public_html/index.php(17): require(‘/home/greattosh .. .’) #16 {main} thrown in
/home/greattoshare/public_html/wp-content/themes/ev-bike-shop-pro/functions.php on
line 54
There has been a critical error on this website.