diff --git a/build.gradle.kts b/build.gradle.kts
index 6ec1cbf1..c20685e9 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -6,13 +6,14 @@ plugins {
 }
 
 allprojects {
-    group = "xyz.nulldev.ts"
+    group = "ir.armor.tachidesk"
 
     version = "1.0"
 
     repositories {
         jcenter()
         mavenCentral()
+        maven("https://maven.google.com/")
         maven("https://jitpack.io")
         maven("https://oss.sonatype.org/content/repositories/snapshots/")
         maven("https://dl.bintray.com/inorichi/maven")
diff --git a/server/src/main/kotlin/ir/armor/tachidesk/impl/Extension.kt b/server/src/main/kotlin/ir/armor/tachidesk/impl/Extension.kt
index 05fd1694..56368449 100644
--- a/server/src/main/kotlin/ir/armor/tachidesk/impl/Extension.kt
+++ b/server/src/main/kotlin/ir/armor/tachidesk/impl/Extension.kt
@@ -71,6 +71,12 @@ private fun dex2jar(dexFile: String, jarFile: String, fileNameWithoutType: Strin
     }
 }
 
+fun loadExtension(jarPath: String, className: String): Any {
+    val classLoader = URLClassLoader(arrayOf<URL>(URL("file:$jarPath")))
+    val classToLoad = Class.forName(className, true, classLoader)
+    return classToLoad.getDeclaredConstructor().newInstance()
+}
+
 fun installExtension(pkgName: String): Int {
     logger.debug("Installing $pkgName")
     val extensionRecord = extensionTableAsDataClass().first { it.pkgName == pkgName }
@@ -101,9 +107,7 @@ fun installExtension(pkgName: String): Int {
             File(dexFilePath).delete()
 
             // update sources of the extension
-            val child = URLClassLoader(arrayOf<URL>(URL("file:$jarFilePath")), this::class.java.classLoader)
-            val classToLoad = Class.forName(className, true, child)
-            val instance = classToLoad.newInstance()
+            val instance = loadExtension(jarFilePath,className)
 
             val extensionId = transaction {
                 return@transaction ExtensionTable.select { ExtensionTable.name eq extensionRecord.name }.first()[ExtensionTable.id]
diff --git a/server/src/main/kotlin/ir/armor/tachidesk/impl/Source.kt b/server/src/main/kotlin/ir/armor/tachidesk/impl/Source.kt
index 59e4eef2..abae2f58 100644
--- a/server/src/main/kotlin/ir/armor/tachidesk/impl/Source.kt
+++ b/server/src/main/kotlin/ir/armor/tachidesk/impl/Source.kt
@@ -17,14 +17,13 @@ import mu.KotlinLogging
 import org.jetbrains.exposed.sql.select
 import org.jetbrains.exposed.sql.selectAll
 import org.jetbrains.exposed.sql.transactions.transaction
-import java.net.URL
-import java.net.URLClassLoader
 import java.util.concurrent.ConcurrentHashMap
 
 private val logger = KotlinLogging.logger {}
 
 private val sourceCache = ConcurrentHashMap<Long, HttpSource>()
 
+
 fun getHttpSource(sourceId: Long): HttpSource {
     val cachedResult: HttpSource? = sourceCache[sourceId]
     if (cachedResult != null) {
@@ -42,12 +41,7 @@ fun getHttpSource(sourceId: Long): HttpSource {
         val jarName = apkName.substringBefore(".apk") + ".jar"
         val jarPath = "${applicationDirs.extensionsRoot}/$jarName"
 
-        val extensionInstance =
-            {
-                val child = URLClassLoader(arrayOf<URL>(URL("file:$jarPath")), this::class.java.classLoader)
-                val classToLoad = Class.forName(className, true, child)
-                classToLoad.getDeclaredConstructor().newInstance()
-            }
+        val extensionInstance = loadExtension(jarPath,className)
 
         if (sourceRecord[SourceTable.partOfFactorySource]) {
             (extensionInstance as SourceFactory).createSources().forEach{
diff --git a/server/src/main/kotlin/ir/armor/tachidesk/model/database/SourceTable.kt b/server/src/main/kotlin/ir/armor/tachidesk/model/database/SourceTable.kt
index f117a577..f3c5a2cf 100644
--- a/server/src/main/kotlin/ir/armor/tachidesk/model/database/SourceTable.kt
+++ b/server/src/main/kotlin/ir/armor/tachidesk/model/database/SourceTable.kt
@@ -15,5 +15,4 @@ object SourceTable : IdTable<Long>() {
     val lang = varchar("lang", 10)
     val extension = reference("extension", ExtensionTable)
     val partOfFactorySource = bool("part_of_factory_source").default(false)
-    val positionInFactorySource = integer("position_in_factory_source").nullable()
 }