Provider not found in the contract using SQLite in android with java -

i want implement provider access sqlite database in java android project using contentprovider class.but when build have error :

failed find provider info com.sdnsoft.natemps.natemps.data.natempsprovider

this code:

the manifest file

<provider android:name="natempsprovider"     android:authorities="com.sdnsoft.natemps.natemps.data"     android:enabled="true"     android:exported="false">     <grant-uri-permission android:pathpattern=".*" /> </provider>  <application     android:allowbackup="true"     android:icon="@mipmap/ic_launcher"     android:label="@string/app_name"     android:roundicon="@mipmap/ic_launcher_round"     android:supportsrtl="true"     android:theme="@style/apptheme">     <activity         android:name=".mainactivity"         android:label="@string/app_name"         android:theme="@style/apptheme.noactionbar">         <intent-filter>             <action android:name="android.intent.action.main" />              <category android:name="android.intent.category.launcher" />         </intent-filter>         <intent-filter>             <action android:name="android.intent.action.view" />             <action android:name="android.intent.action.edit" />             <action android:name="android.intent.action.pick" />             <category android:name="android.intent.category.default" />             <data android:mimetype="vnd.android.cursor.dir/vnd.com.sdnsoft.natemps.natemps.data.natempsprovider" />         </intent-filter>     </activity>     <activity         android:name=".loginactivity"         android:label="@string/title_activity_login"></activity> </application> 

the content provider

public class natempsprovider     extends contentprovider implements contentprovider.pipedatawriter<cursor> {    // used debugging , logging private static final string tag = "natempsprovider";    /**  * database provider uses underlying data store  */ private static final string database_name = "natempscontract.db";    /**  * database version  */ private static final int database_version = 1; 

the contract

public class natempscontract { public static final string authority = "com.sdnsoft.natemps.natemps.data.natempsprovider"; 

// rest of static class

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