diff --git a/Readme.md b/Readme.md
index 5b6cd0c..e61acd0 100644
--- a/Readme.md
+++ b/Readme.md
@@ -4,7 +4,10 @@ How to compile
 ```bash
 gcc main.c -o hello
 ```
-#Issues
+<<<<<<< HEAD
+
 
-- [ ] Error Catching
 
+#Issues
+- [ ] Error catching
+>>>>>>> error-catching
diff --git a/main.c b/main.c
index 067e418..0dbdf49 100644
--- a/main.c
+++ b/main.c
@@ -6,26 +6,50 @@ int main (int argc, char *argv[]){
 	int fd;
 	//export
 	fd = open("/sys/class/gpio/chip0/export", O_WRONLY);
+	if(fd<0)
+	{
+		perror("Error openng the GPIO export path");
+		return -1;
+	}
 	write(fd, "17",2);
 	close(fd);
 	//pin direction
 	fd = open("/sys/class/gpio/chip0/gpio17/direction", O_WRONLY);
+	if(fd<0)
+	{
+		perror("Error openng the GPIO export path");
+		return -1;
+	}
 	write(fd, "out",3);
 	close(fd);
 	//pin value
 	fd = open("/sys/class/gpio/chip0/gpio17/value", O_WRONLY);
+	if(fd<0)
+	{
+		perror("Error openng the GPIO export path");
+		return -1;
+	}
 	write(fd, "1",1);
 	close(fd);
 	sleep(1);
 	//pin apagao
-	
 	fd = open("/sys/class/gpio/chip0/gpio17/value", O_WRONLY);
+	if(fd<0)
+	{
+		perror("Error openng the GPIO export path");
+		return -1;
+	}
 	write(fd, "0",1);
 	close(fd);
 	sleep(1);
 	//unexport
 	
 	fd = open("/sys/class/gpio/chip0/unexport", O_WRONLY);
+	if(fd<0)
+	{
+		perror("Error openng the GPIO export path");
+		return -1;
+	}
 	write(fd, "17",2);
 	close(fd);