First:
C:\Users\Romulo\Desktop\ushahidi-Ushahidi_Android-448dc5e\Core\res\values\styles.xml:16: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.Sherlock'.

In line:
    <style name="Theme.Ushahidi" parent="Theme.Sherlock">

Second:
C:\Users\Romulo\Desktop\ushahidi-Ushahidi_Android-448dc5e\Core\res\values\styles.xml:18: error: Error: No resource found that matches the given name: attr 'actionBarTabStyle'.

In line:
        <item name="actionBarTabStyle">@style/UshahidiActionBarTabStyle</item>

Third:
C:\Users\Romulo\Desktop\ushahidi-Ushahidi_Android-448dc5e\Core\res\values\styles.xml:17: error: Error: No resource found that matches the given name: attr 'selectableItemBackground'.

In line:
            <item name="selectableItemBackground">@drawable/ad_selectable_background</item>

Fourth:
C:\Users\Romulo\Desktop\ushahidi-Ushahidi_Android-448dc5e\Core\res\values\styles.xml:22: error: Error retrieving parent for item: No resource found that matches the given name 'Widget.Sherlock.Light.ActionBar.TabView'.

In Line:
<style name="UshahidiActionBarTabStyle" parent="Widget.Sherlock.Light.ActionBar.TabView">