Fix all compile errors from v0.4.0 update

beacon_node/beacon_chain/src/errors.rs

@@ -0,0 +1,33 @@
+use fork_choice::ForkChoiceError;
+use state_processing::BlockProcessingError;
+use types::*;
+
+macro_rules! easy_from_to {
+    ($from: ident, $to: ident) => {
+        impl From<$from> for $to {
+            fn from(e: $from) -> $to {
+                $to::$from(e)
+            }
+        }
+    };
+}
+
+#[derive(Debug, PartialEq)]
+pub enum BeaconChainError {
+    InsufficientValidators,
+    BadRecentBlockRoots,
+    BeaconStateError(BeaconStateError),
+    DBInconsistent(String),
+    DBError(String),
+    ForkChoiceError(ForkChoiceError),
+    MissingBeaconBlock(Hash256),
+    MissingBeaconState(Hash256),
+}
+
+#[derive(Debug, PartialEq)]
+pub enum BlockProductionError {
+    UnableToGetBlockRootFromState,
+    BlockProcessingError(BlockProcessingError),
+}
+
+easy_from_to!(BlockProcessingError, BlockProductionError);