incorrect shortcode?

hey there, couldnt find the shortcode anywhere so googled and found [nimble-portfolio] which i inserted into a page but i get this error, portfolio items appear underneath it fine though.

Warning: Illegal string offset ‘template’ in C:\wamp\www\Freelance\wp-content\plugins\nimble-portfolio\nimble-portfolio.php on line 170
Call Stack
# Time Memory Function Location
1 0.0003 143040 {main}( ) ..\index.php:0
2 0.0005 145160 require( ‘C:\wamp\www\Freelance\wp-blog-header.php’ ) ..\index.php:17
3 0.4341 16803784 require_once( ‘C:\wamp\www\Freelance\wp-includes\template-loader.php’ ) ..\wp-blog-header.php:16
4 0.4361 16810656 include( ‘C:\wamp\www\Freelance\wp-content\themes\pitch\page-full.php’ ) ..\template-loader.php:47
5 0.4983 16925848 the_content( ) ..\page-full.php:13
6 0.4984 16926208 apply_filters( ) ..\post-template.php:166
7 0.4991 16927592 call_user_func_array ( ) ..\plugin.php:173
8 0.4991 16927608 do_shortcode( ) ..\plugin.php:173
9 0.4991 16928440 preg_replace_callback ( ) ..\shortcodes.php:151
10 0.4991 16929512 do_shortcode_tag( ) ..\shortcodes.php:151
11 0.4992 16929672 call_user_func ( ) ..\shortcodes.php:236
12 0.4992 16929696 nimble_portfolio( ) ..\shortcodes.php:236
13 0.4992 16946216 nimble_portfolio_show( ) ..\nimble-portfolio.php:162

http://wordpress.org/extend/plugins/nimble-portfolio/