diff --git a/pkg/leakybucket/manager.go b/pkg/leakybucket/manager.go
index 0fe6fd495..78d43b283 100644
--- a/pkg/leakybucket/manager.go
+++ b/pkg/leakybucket/manager.go
@@ -111,7 +111,10 @@ func LoadBuckets(files []string, dataFolder string) ([]BucketFactory, chan types
 	)
 
 	var seed namegenerator.Generator = namegenerator.NewNameGenerator(time.Now().UTC().UnixNano())
-	exprhelpers.Init()
+	err := exprhelpers.Init()
+	if err != nil {
+		return nil, nil, err
+	}
 
 	response = make(chan types.Event, 1)
 	for _, f := range files {
@@ -280,6 +283,9 @@ func LoadBucket(g *BucketFactory, dataFolder string) error {
 	if len(g.Data) > 0 {
 		for _, data := range g.Data {
 			err = exprhelpers.FileInit(dataFolder, data.DestPath)
+			if err != nil {
+				log.Errorf(err.Error())
+			}
 		}
 	}
 
diff --git a/pkg/parser/stage.go b/pkg/parser/stage.go
index 66efecb97..ff05c90d2 100644
--- a/pkg/parser/stage.go
+++ b/pkg/parser/stage.go
@@ -43,7 +43,10 @@ func LoadStages(stageFiles []Stagefile, pctx *UnixParserCtx) ([]Node, error) {
 	tmpstages := make(map[string]bool)
 	pctx.Stages = []string{}
 
-	exprhelpers.Init()
+	err := exprhelpers.Init()
+	if err != nil {
+		return nil, err
+	}
 	for _, stageFile := range stageFiles {
 		if !strings.HasSuffix(stageFile.Filename, ".yaml") {
 			log.Warningf("skip non yaml : %s", stageFile.Filename)
@@ -115,6 +118,9 @@ func LoadStages(stageFiles []Stagefile, pctx *UnixParserCtx) ([]Node, error) {
 			if len(node.Data) > 0 {
 				for _, data := range node.Data {
 					err = exprhelpers.FileInit(pctx.DataFolder, data.DestPath)
+					if err != nil {
+						log.Errorf(err.Error())
+					}
 				}
 			}
 			nodes = append(nodes, node)
diff --git a/pkg/types/dataset.go b/pkg/types/dataset.go
index dd3797466..fa5c55816 100644
--- a/pkg/types/dataset.go
+++ b/pkg/types/dataset.go
@@ -16,7 +16,7 @@ type DataSource struct {
 }
 
 type DataSet struct {
-	Data []*DataSource `yaml:"data",omitempty`
+	Data []*DataSource `yaml:"data,omitempty"`
 }
 
 func downloadFile(url string, destPath string) error {