diff --git a/.idea/artifacts/RealTimeSerialPlotter_jar.xml b/.idea/artifacts/RealTimeSerialPlotter_jar.xml
new file mode 100644
index 0000000..79f253f
--- /dev/null
+++ b/.idea/artifacts/RealTimeSerialPlotter_jar.xml
@@ -0,0 +1,11 @@
+<component name="ArtifactManager">
+  <artifact type="jar" name="RealTimeSerialPlotter:jar">
+    <output-path>$PROJECT_DIR$/out/artifacts/RealTimeSerialPlotter_jar</output-path>
+    <root id="archive" name="RealTimeSerialPlotter.jar">
+      <element id="module-output" name="RealTimeSerialPlotter" />
+      <element id="extracted-dir" path="$MAVEN_REPOSITORY$/net/java/openjfx/backport/openjfx-78-backport/1.8.0-ea-b96.1/openjfx-78-backport-1.8.0-ea-b96.1.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$MAVEN_REPOSITORY$/com/github/purejavacomm/purejavacomm/1.0.2.RELEASE/purejavacomm-1.0.2.RELEASE.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$MAVEN_REPOSITORY$/net/java/dev/jna/jna/4.2.2/jna-4.2.2.jar" path-in-jar="/" />
+    </root>
+  </artifact>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index bdc94d8..27321b1 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_9" default="false" project-jdk-name="9.0" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_9" default="false" project-jdk-name="9" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file
diff --git a/src/META-INF/MANIFEST.MF b/src/META-INF/MANIFEST.MF
new file mode 100644
index 0000000..9fef7b6
--- /dev/null
+++ b/src/META-INF/MANIFEST.MF
@@ -0,0 +1,4 @@
+Manifest-Version: 1.0
+Class-Path: purejavacomm-1.0.2.RELEASE.jar
+Main-Class: application.Main
+
diff --git a/src/application/Main.java b/src/application/Main.java
index e3eb3b3..6f3f82c 100644
--- a/src/application/Main.java
+++ b/src/application/Main.java
@@ -4,6 +4,7 @@
 import javafx.fxml.FXMLLoader;
 import javafx.scene.Parent;
 import javafx.scene.Scene;
+import javafx.scene.image.Image;
 import javafx.stage.Stage;
 import mainwindow.CaptureController;
 import plot.Plot;
@@ -22,6 +23,9 @@ public void start(Stage primaryStage) throws Exception
         primaryStage.setMinHeight(450.0);
         primaryStage.setMinWidth(620.0);
 
+        Image applicationIcon = new Image(getClass().getResourceAsStream("icon.png"));
+        primaryStage.getIcons().add(applicationIcon);
+
         primaryStage.setOnCloseRequest(event ->
         {
             CaptureController.isActiveExport = false;
diff --git a/src/application/RealTimeSerialPlotter_box.png b/src/application/RealTimeSerialPlotter_box.png
new file mode 100644
index 0000000..b3774cc
Binary files /dev/null and b/src/application/RealTimeSerialPlotter_box.png differ
diff --git a/src/application/icon.png b/src/application/icon.png
new file mode 100644
index 0000000..b849f9e
Binary files /dev/null and b/src/application/icon.png differ
diff --git a/src/mainwindow/CaptureController.java b/src/mainwindow/CaptureController.java
index 99a00fd..76e8c54 100644
--- a/src/mainwindow/CaptureController.java
+++ b/src/mainwindow/CaptureController.java
@@ -85,7 +85,7 @@ public void startOverwriteClick()
     {
         file = new File(filePathTextField.getText());
 
-        if(file.exists())
+        if(file.getPath().substring(file.getPath().length() - 3, file.getPath().length()).equals("txt"))
         {
             if(PortReader.getInstance().isOpen())
             {
@@ -155,7 +155,7 @@ public void startOverwriteClick()
         }
         else
         {
-            showErrorAlert("Podana ścieżka jest niepoprawna!");
+            showErrorAlert("Given path is wrong!");
         }
     }
 
diff --git a/src/mainwindow/PortController.java b/src/mainwindow/PortController.java
index 9a704c6..12afe87 100644
--- a/src/mainwindow/PortController.java
+++ b/src/mainwindow/PortController.java
@@ -1,5 +1,6 @@
 package mainwindow;
 
+import javafx.scene.control.Alert;
 import plot.Plot;
 import port.PortReader;
 import javafx.fxml.FXML;
@@ -115,6 +116,17 @@ public void onActionConnectButton()
                     PortReader.getInstance().startReading();
                     Plot.getInstance().startPlotting();
                 }
+                else
+                {
+                    Log.getInstance().log("An attempt to open the port was unsuccessful.");
+
+                    Alert alert = new Alert(Alert.AlertType.WARNING);
+
+                    alert.setTitle("Real Time Serial Plotter");
+                    alert.setHeaderText(null);
+                    alert.setContentText("Port is already in use. Cannot open.");
+                    alert.showAndWait();
+                }
             }
         }
         else
diff --git a/src/mainwindow/captureView.fxml b/src/mainwindow/captureView.fxml
index d90d4db..79781c6 100644
--- a/src/mainwindow/captureView.fxml
+++ b/src/mainwindow/captureView.fxml
@@ -33,7 +33,7 @@
                         <Font size="11.0" />
                      </font>
                   </Label>
-                  <TextField fx:id="filePathTextField" focusTraversable="false" minHeight="20.0" prefHeight="10.0" prefWidth="268.0" text="C:\captureOfData.txt">
+                  <TextField fx:id="filePathTextField" editable="false" focusTraversable="false" minHeight="20.0" prefHeight="10.0" prefWidth="268.0" text="C:\captureOfData.txt">
                      <HBox.margin>
                         <Insets left="5.0" right="5.0" />
                      </HBox.margin>
diff --git a/src/port/Port.java b/src/port/Port.java
index a926b2b..8ece4b6 100644
--- a/src/port/Port.java
+++ b/src/port/Port.java
@@ -100,9 +100,6 @@ public boolean open(String serialPortName, int dataBits, int stopBits, int parit
         }
         catch (Throwable thwble)
         {
-            Log.getInstance().log("An attempt to open the port was unsuccessful.");
-            thwble.printStackTrace();
-
             return false;
         }
     }