diff --git a/scripts/birbnetes/run_scenarios.sh b/scripts/birbnetes/run_scenarios.sh
index c770335..707277d 100644
--- a/scripts/birbnetes/run_scenarios.sh
+++ b/scripts/birbnetes/run_scenarios.sh
@@ -18,6 +18,8 @@ if ! [[ $2 =~ $re ]] ; then
 	exit 1
 fi
 
+chmod +x runner.sh
+
 script_root_path="$(dirname "$(readlink -f "$0")")"
 root_out_folder=${script_root_path}/output
 num_of_processes=$1
diff --git a/src/edu/boun/edgecloudsim/mobility/StationaryMobility.java b/src/edu/boun/edgecloudsim/mobility/StationaryMobility.java
index d705424..bbdf211 100644
--- a/src/edu/boun/edgecloudsim/mobility/StationaryMobility.java
+++ b/src/edu/boun/edgecloudsim/mobility/StationaryMobility.java
@@ -70,7 +70,7 @@ public class StationaryMobility extends MobilityModel {
 
                 while(placeFound == false){
                     int newDatacenterId = SimUtils.getRandomNumber(0, SimSettings.getInstance().getNumOfEdgeDatacenters()-1);
-                    if(newDatacenterId != currentLocationId){
+                    if(newDatacenterId == currentLocationId){
                         placeFound = true;
                         Node datacenterNode = datacenterList.item(newDatacenterId);
                         Element datacenterElement = (Element) datacenterNode;
@@ -97,7 +97,7 @@ public class StationaryMobility extends MobilityModel {
     public Location getLocation(int deviceId, double time) {
         TreeMap<Double, Location> treeMap = treeMapArray.get(deviceId);
 
-        Map.Entry<Double, Location> e = treeMap.floorEntry(0.0);
+        Map.Entry<Double, Location> e = treeMap.floorEntry(time);
 
         if(e == null){
             SimLogger.printLine("impossible is occurred! no location is found for the device '" + deviceId + "' at " + time);