urgent help needed how to fix error

how do i fix this log error?
/system/storage/modification/catalog/view/theme/newstore/template/product/product.tpl on line 9
2019-06-26 1:54:33 - PHP Notice: Undefined variable: minifycss in
/system/storage/modification/catalog/view/theme/newstore/template/common/header.tpl on line 77
2019-06-26 1:54:33 - PHP Notice: Undefined variable: minifyjs in
/system/storage/modification/catalog/view/theme/newstore/template/common/header.tpl on line 177
2019-06-26 1:55:50 - PHP Notice: Undefined variable: minifycss in
/system/storage/modification/catalog/view/theme/newstore/template/common/header.tpl on line 77
2019-06-26 1:55:50 - PHP Notice: Undefined variable: minifyjs in
/system/storage/modification/catalog/view/theme/newstore/template/common/header.tpl on line 177
2019-06-26 1:56:44 - PHP Notice: Undefined variable: minifycss in
/system/storage/modification/catalog/view/theme/newstore/template/common/header.tpl on line 77
2019-06-26 1:56:44 - PHP Notice: Undefined variable: minifyjs in
/system/storage/modification/catalog/view/theme/newstore/template/common/header.tpl on line 177

appsfinder wrote: ↑

Wed Jun 26, 2019 11:08 am

how do i fix this log error?
...

Either contact the support of this custom theme or check the definitions inside the controller file - by yourself - which are missing.