Error message

• Warning: exif_imagetype(public://product-image/iris_a03898_ukrane.jpg): failed to open stream: "DrupalPublicStreamWrapper::stream_open" call failed in _imagewebp_prepare_image() (line 110 of sites/all/modules/imagewebp/imagewebp.module).
• Warning: getimagesize(public://product-image/iris_a03898_ukrane.jpg): failed to open stream: "DrupalPublicStreamWrapper::stream_open" call failed in _imagewebp_prepare_image() (line 113 of sites/all/modules/imagewebp/imagewebp.module).
• Warning: exif_imagetype(public://product-image/iris_a03898_ukrane.jpg): failed to open stream: "DrupalPublicStreamWrapper::stream_open" call failed in _imagewebp_prepare_image() (line 110 of sites/all/modules/imagewebp/imagewebp.module).
• Warning: getimagesize(public://product-image/iris_a03898_ukrane.jpg): failed to open stream: "DrupalPublicStreamWrapper::stream_open" call failed in _imagewebp_prepare_image() (line 113 of sites/all/modules/imagewebp/imagewebp.module).