diff --git a/src/error.h b/src/error.h
new file mode 100644
index 0000000..e4c0473
--- /dev/null
+++ b/src/error.h
@@ -0,0 +1,57 @@
+#ifndef _ERROR_H
+#define _ERROR_H
+
+
+typedef enum {
+  EOK=0,
+  ECALL,    // CALL/CCALL error
+  EDATA,    // DATA  error
+  EEXPR,    // Expression error
+  EEVENT,   // Event error
+  EHEAP,    // Heap error
+  EINPUT,   // Input error (EWOULDBLOCk...)
+  ENOTFOUND,  
+  EOP,      // Instruction error
+  EPROC,    // Procedure error
+  ERANGE,   // Array range error
+  ERUN,     // Run-time error
+  ESTACK,   // Stack error
+  ESYNTAX,  // Syntax error
+  ETASK,    // Task (creation) error
+  ETODO,    // Not yet implemented
+  ETYPE,
+  EVAR,      // Variable error
+  EWOULDBLOCK,  // Blocking IO not allowed
+} errors_t;
+
+#define ERRORS char *Errors[]={\
+  "EOK",\
+  "ECALL",\
+  "EDATA",\
+  "EEXPR",\
+  "EEVENT",\
+  "EHEAP",\
+  "EINPUT",\
+  "ENOTFOUND",\
+  "EOP",\
+  "EPROC",\
+  "ERANGE",\
+  "ERUN",\
+  "ESTACK",\
+  "ESYNTAX",\
+  "ETASK",\
+  "ETODO",\
+  "ETYPE",\
+  "EVAR",\
+  "EWOULDBLOCK",\
+}
+extern char *Errors[];
+
+typedef int8_t error_t;
+// void error(reg_t *R,error_t e);
+
+#define RETURNERROR(R,e,status) { error(R,e); return status; }
+#define RETURNERROR0(R,e) { error(R,e); return; }
+
+
+#endif