Error log

Hi Stephan,
I’m in the process of setting up the suite of Post Pay Counter plugins. I have 3 different error/warning messages so far.

1. Post Pay Counter
Message when activated: The plugin generated 299 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.

2. When activated the Post Bonus got these warnings:
Warning: call_user_func_array() expects parameter 1 to be a valid callback, class ‘PPCP_PB_general_functions’ does not have a method ‘check_ppcp_class’ in /home/j93df0x5apwc8q/public_html/wp-includes/plugin.php on line 525

Warning: Cannot modify header information – headers already sent by (output started at /home/j93df0x5apwc8q/public_html/wp-includes/plugin.php:525) in /home/j93df0x5apwc8q/public_html/wp-includes/pluggable.php on line 1228

Warning: Cannot modify header information – headers already sent by (output started at /home/j93df0x5apwc8q/public_html/wp-includes/plugin.php:525) in /home/j93df0x5apwc8q/public_html/wp-includes/pluggable.php on line 1228

3. Error Log:
2016-02-23 22:40:35
An error was thrown with code “ga_get_data_error”, message “Error: 400: Error calling GET https://www.googleapis.com/analytics/v3/data/ga?ids=ga%3A116133562&start-date=&end-date=2016-02-23&metrics=ga%3AuniquePageviews&max-results=9999&dimensions=ga%3ApagePath&filters=ga%3ApagePath%21%40%2F404.html%3Bga%3ApagePath%21%40%2Fsearch%2F&start-index=1: (400) Invalid value ”. Values must match the following regular expression: ‘[0-9]{4}-[0-9]{2}-[0-9]{2}|today|yesterday|[0-9]+(daysAgo)'” and debug data “array (
‘profile’ => ‘116133562’,
‘start_time’ => false,
‘end_time’ => ‘2016-02-23’,
‘metrics’ =>
array (
0 => ‘ga:uniquePageviews’,
),
‘optional_params’ =>
array (
‘max-results’ => 9999,
‘dimensions’ => ‘ga:pagePath’,
‘filters’ => ‘ga:pagePath!@/404.html;ga:pagePath!@/search/’,
‘start-index’ => 1,
),
‘last_request_update_status’ => NULL,
)”.