diff --git a/io/src/main/java/org/gcube/resourcemanagement/manager/exception/ErrorCode.java b/io/src/main/java/org/gcube/resourcemanagement/manager/exception/ErrorCode.java
new file mode 100644
index 0000000..58398d5
--- /dev/null
+++ b/io/src/main/java/org/gcube/resourcemanagement/manager/exception/ErrorCode.java
@@ -0,0 +1,16 @@
+/**
+ * 
+ */
+package org.gcube.resourcemanagement.manager.exception;
+
+/**
+ * Interface for error codes.
+ * 
+ * @author Manuele Simi (ISTI CNR)
+ *
+ */
+public interface ErrorCode {
+	public int getId();
+
+	public String getMsg();
+}
diff --git a/io/src/main/java/org/gcube/resourcemanagement/manager/exception/ExceptionCode.java b/io/src/main/java/org/gcube/resourcemanagement/manager/exception/ExceptionCode.java
new file mode 100644
index 0000000..ce28bd9
--- /dev/null
+++ b/io/src/main/java/org/gcube/resourcemanagement/manager/exception/ExceptionCode.java
@@ -0,0 +1,31 @@
+package org.gcube.resourcemanagement.manager.exception;
+
+/**
+ * Exception codes handled with {@link RMException}.
+ * 
+ * @author Manuele Simi (ISTI CNR)
+ *
+ */
+public enum ExceptionCode implements ErrorCode {
+	
+	INVALID_REQUEST(0, "The request is invalid"),
+	MISSING_PARAMETER(1, "Required query parameter is missing"),
+	MISSING_HEADER(2, "Required header is missing"),
+	CONTEXT_ALREADY_EXIST(3, "Required header is missing");
+	
+	private final int id;
+	private final String msg;
+
+	ExceptionCode(int id, String msg) {
+		this.id = id;
+		this.msg = msg;
+	}
+
+	public int getId() {
+		return this.id;
+	}
+
+	public String getMsg() {
+		return this.msg;
+	}
+}
diff --git a/io/src/main/java/org/gcube/resourcemanagement/manager/exception/RMException.java b/io/src/main/java/org/gcube/resourcemanagement/manager/exception/RMException.java
new file mode 100644
index 0000000..466f9ad
--- /dev/null
+++ b/io/src/main/java/org/gcube/resourcemanagement/manager/exception/RMException.java
@@ -0,0 +1,29 @@
+package org.gcube.resourcemanagement.manager.exception;
+
+/**
+ * Exception returned by the Resource Manager.
+ * 
+ * @author Manuele Simi (ISTI CNR)
+ *
+ */
+public class RMException extends Exception {
+
+	private static final long serialVersionUID = 333945715086602250L;
+
+	private final int errorCode;
+	private final String errorMsg;
+
+	public RMException(ExceptionCode code) {
+		this.errorMsg = code.getMsg();
+		this.errorCode = code.getId();
+	}
+
+	public int getErrorCode() {
+		return errorCode;
+	}
+
+	public String getErrorMsg() {
+		return errorMsg;
+	}
+
+}
diff --git a/io/src/main/java/org/gcube/resourcemanagement/manager/exception/package-info.java b/io/src/main/java/org/gcube/resourcemanagement/manager/exception/package-info.java
new file mode 100644
index 0000000..6c9ff71
--- /dev/null
+++ b/io/src/main/java/org/gcube/resourcemanagement/manager/exception/package-info.java
@@ -0,0 +1,6 @@
+/**
+ * Exception handling in the Resource Management. 
+ * @author Manuele Simi (ISTI - CNR)
+ *
+ */
+package org.gcube.resourcemanagement.manager.exception;
\ No newline at end of file
diff --git a/io/src/main/java/org/gcube/resourcemanagement/manager/io/package-info.java b/io/src/main/java/org/gcube/resourcemanagement/manager/io/package-info.java
deleted file mode 100644
index 9bd3412..0000000
--- a/io/src/main/java/org/gcube/resourcemanagement/manager/io/package-info.java
+++ /dev/null
@@ -1,5 +0,0 @@
-/**
- * @author Manuele Simi (ISTI - CNR)
- *
- */
-package org.gcube.resourcemanagement.manager.io;
\ No newline at end of file