Warning: call_user_func_array() 'raindrops_add_header_archive_description'

Hi Pink Chains

reinstall theme

open style.css

/*
Theme Name: raindrops
Theme URI: http://www.tenman.info/wp3/raindrops/
Description: This theme can change freely fonts,layout,color scheme and header image for each post,page. The google fonts, you can use freely in the post more than 90percent of the fonts.Color scheme and layout, you can freely change from theme customizer.For more updates, please make sure to open the link of the changelog from the help tab of this theme page.Add new post, so also to help tab of edit post page has been described how to use tips, please visit
Author: Tenman
Author URI: http://www.tenman.info/wp3/
Version: 1.275
Tags: black, blue, gray, brown, green, orange, pink, purple, red, silver, tan, white, yellow, dark, light, one-column, two-columns, three-columns, four-columns, left-sidebar, right-sidebar, custom-colors, custom-header, custom-background, custom-menu, editor-style, theme-options, threaded-comments, sticky-post, translation-ready, post-formats, featured-images, full-width-template, fixed-layout, fluid-layout, responsive-layout
License: GNU General Public License v2.0
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: Raindrops
*/

above Change from Version: 1.275 to Version: 1.274

then Once showing your blog.

Maybe you can reinstall raindrops.

or

if you already customized functions.php

Add functions.php top below code.

function raindrops_add_header_archive_description(){

}

Thank you.