diff --git a/config/cdrcconfig.go b/config/cdrcconfig.go
index e81df5a4d..369831061 100644
--- a/config/cdrcconfig.go
+++ b/config/cdrcconfig.go
@@ -113,7 +113,9 @@ func (self *CdrcConfig) loadFromJsonCfg(jsnCfg *CdrcJsonCfg) error {
 		}
 	}
 	if jsnCfg.Tenant != nil {
-		self.Tenant = NewRSRParsersMustCompile(*jsnCfg.Tenant, true)
+		if self.Tenant, err = NewRSRParsers(*jsnCfg.Tenant, true); err != nil {
+			return err
+		}
 	}
 	if jsnCfg.Continue_on_success != nil {
 		self.ContinueOnSuccess = *jsnCfg.Continue_on_success
@@ -127,16 +129,24 @@ func (self *CdrcConfig) loadFromJsonCfg(jsnCfg *CdrcJsonCfg) error {
 		self.PartialCacheExpiryAction = *jsnCfg.Partial_cache_expiry_action
 	}
 	if jsnCfg.Header_fields != nil {
-		self.HeaderFields = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Header_fields)
+		if self.HeaderFields, err = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Header_fields); err != nil {
+			return err
+		}
 	}
 	if jsnCfg.Content_fields != nil {
-		self.ContentFields = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Content_fields)
+		if self.ContentFields, err = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Content_fields); err != nil {
+			return err
+		}
 	}
 	if jsnCfg.Trailer_fields != nil {
-		self.TrailerFields = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Trailer_fields)
+		if self.TrailerFields, err = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Trailer_fields); err != nil {
+			return err
+		}
 	}
 	if jsnCfg.Cache_dump_fields != nil {
-		self.CacheDumpFields = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Cache_dump_fields)
+		if self.CacheDumpFields, err = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Cache_dump_fields); err != nil {
+			return err
+		}
 	}
 	return nil
 }
diff --git a/config/cdreconfig.go b/config/cdreconfig.go
index e05bc16eb..f4332d343 100644
--- a/config/cdreconfig.go
+++ b/config/cdreconfig.go
@@ -39,7 +39,7 @@ type CdreConfig struct {
 	TrailerFields       []*FCTemplate
 }
 
-func (self *CdreConfig) loadFromJsonCfg(jsnCfg *CdreJsonCfg) error {
+func (self *CdreConfig) loadFromJsonCfg(jsnCfg *CdreJsonCfg) (err error) {
 	if jsnCfg == nil {
 		return nil
 	}
@@ -80,13 +80,19 @@ func (self *CdreConfig) loadFromJsonCfg(jsnCfg *CdreJsonCfg) error {
 		self.CostMultiplyFactor = *jsnCfg.Cost_multiply_factor
 	}
 	if jsnCfg.Header_fields != nil {
-		self.HeaderFields = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Header_fields)
+		if self.HeaderFields, err = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Header_fields); err != nil {
+			return err
+		}
 	}
 	if jsnCfg.Content_fields != nil {
-		self.ContentFields = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Content_fields)
+		if self.ContentFields, err = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Content_fields); err != nil {
+			return err
+		}
 	}
 	if jsnCfg.Trailer_fields != nil {
-		self.TrailerFields = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Trailer_fields)
+		if self.TrailerFields, err = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Trailer_fields); err != nil {
+			return err
+		}
 	}
 	return nil
 }
diff --git a/config/fctemplate.go b/config/fctemplate.go
index 56547ee21..fbac26051 100755
--- a/config/fctemplate.go
+++ b/config/fctemplate.go
@@ -18,8 +18,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>
 
 package config
 
-func NewFCTemplateFromFCTemplateJsonCfg(jsnCfg *FcTemplateJsonCfg) *FCTemplate {
+func NewFCTemplateFromFCTemplateJsonCfg(jsnCfg *FcTemplateJsonCfg) (*FCTemplate, error) {
 	fcTmp := new(FCTemplate)
+	var err error
 	if jsnCfg.Tag != nil {
 		fcTmp.Tag = *jsnCfg.Tag
 	}
@@ -36,7 +37,10 @@ func NewFCTemplateFromFCTemplateJsonCfg(jsnCfg *FcTemplateJsonCfg) *FCTemplate {
 		}
 	}
 	if jsnCfg.Value != nil {
-		fcTmp.Value = NewRSRParsersMustCompile(*jsnCfg.Value, true)
+		fcTmp.Value, err = NewRSRParsers(*jsnCfg.Value, true)
+		if err != nil {
+			return nil, err
+		}
 	}
 	if jsnCfg.Width != nil {
 		fcTmp.Width = *jsnCfg.Width
@@ -83,7 +87,7 @@ func NewFCTemplateFromFCTemplateJsonCfg(jsnCfg *FcTemplateJsonCfg) *FCTemplate {
 	if jsnCfg.Mask_length != nil {
 		fcTmp.MaskLen = *jsnCfg.Mask_length
 	}
-	return fcTmp
+	return fcTmp, nil
 }
 
 type FCTemplate struct {
@@ -109,10 +113,14 @@ type FCTemplate struct {
 	MaskLen          int
 }
 
-func FCTemplatesFromFCTemapltesJsonCfg(jsnCfgFlds []*FcTemplateJsonCfg) []*FCTemplate {
+func FCTemplatesFromFCTemapltesJsonCfg(jsnCfgFlds []*FcTemplateJsonCfg) ([]*FCTemplate, error) {
 	retFields := make([]*FCTemplate, len(jsnCfgFlds))
+	var err error
 	for i, jsnFld := range jsnCfgFlds {
-		retFields[i] = NewFCTemplateFromFCTemplateJsonCfg(jsnFld)
+		retFields[i], err = NewFCTemplateFromFCTemplateJsonCfg(jsnFld)
+		if err != nil {
+			return nil, err
+		}
 	}
-	return retFields
+	return retFields, err
 }
diff --git a/config/fctemplate_test.go b/config/fctemplate_test.go
index 938e9179d..dc58b6396 100755
--- a/config/fctemplate_test.go
+++ b/config/fctemplate_test.go
@@ -39,8 +39,9 @@ func TestNewFCTemplateFromFCTemplateJsonCfg(t *testing.T) {
 		Filters: []string{"Filter1", "Filter2"},
 		Value:   NewRSRParsersMustCompile("cgrates.org", true),
 	}
-	rcv := NewFCTemplateFromFCTemplateJsonCfg(jsonCfg)
-	if !reflect.DeepEqual(expected, rcv) {
+	if rcv, err := NewFCTemplateFromFCTemplateJsonCfg(jsonCfg); err != nil {
+		t.Error(err)
+	} else if !reflect.DeepEqual(expected, rcv) {
 		t.Errorf("expected: %s ,received: %s", utils.ToJSON(expected), utils.ToJSON(rcv))
 	}
 }
@@ -78,8 +79,9 @@ func TestFCTemplatesFromFCTemapltesJsonCfg(t *testing.T) {
 			Value:   NewRSRParsersMustCompile("SampleValue", true),
 		},
 	}
-	rcv := FCTemplatesFromFCTemapltesJsonCfg(jsnCfgs)
-	if !reflect.DeepEqual(expected, rcv) {
+	if rcv, err := FCTemplatesFromFCTemapltesJsonCfg(jsnCfgs); err != nil {
+		t.Error(err)
+	} else if !reflect.DeepEqual(expected, rcv) {
 		t.Errorf("expected: %s ,received: %s", utils.ToJSON(expected), utils.ToJSON(rcv))
 	}
 }
diff --git a/config/httpagntcfg.go b/config/httpagntcfg.go
index e4a16dd7d..7d5c1b16b 100644
--- a/config/httpagntcfg.go
+++ b/config/httpagntcfg.go
@@ -113,10 +113,14 @@ func (ha *HttpAgntProcCfg) loadFromJsonCfg(jsnCfg *HttpAgentProcessorJsnCfg) (er
 		ha.ContinueOnSuccess = *jsnCfg.Continue_on_success
 	}
 	if jsnCfg.Request_fields != nil {
-		ha.RequestFields = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Request_fields)
+		if ha.RequestFields, err = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Request_fields); err != nil {
+			return
+		}
 	}
 	if jsnCfg.Reply_fields != nil {
-		ha.ReplyFields = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Reply_fields)
+		if ha.ReplyFields, err = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Reply_fields); err != nil {
+			return
+		}
 	}
 	return nil
 }
diff --git a/config/loadersconfig.go b/config/loadersconfig.go
index 7cad19bdc..497372209 100644
--- a/config/loadersconfig.go
+++ b/config/loadersconfig.go
@@ -58,7 +58,7 @@ type LoaderDataType struct { //rename to LoaderDataType
 	Fields   []*FCTemplate
 }
 
-func (self *LoaderDataType) loadFromJsonCfg(jsnCfg *LoaderJsonDataType) error {
+func (self *LoaderDataType) loadFromJsonCfg(jsnCfg *LoaderJsonDataType) (err error) {
 	if jsnCfg == nil {
 		return nil
 	}
@@ -69,7 +69,9 @@ func (self *LoaderDataType) loadFromJsonCfg(jsnCfg *LoaderJsonDataType) error {
 		self.Filename = *jsnCfg.File_name
 	}
 	if jsnCfg.Fields != nil {
-		self.Fields = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Fields)
+		if self.Fields, err = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Fields); err != nil {
+			return
+		}
 	}
 	return nil
 }
diff --git a/config/raconfig.go b/config/raconfig.go
index e7def58e4..ba0caf256 100644
--- a/config/raconfig.go
+++ b/config/raconfig.go
@@ -136,10 +136,14 @@ func (self *RARequestProcessor) loadFromJsonCfg(jsnCfg *RAReqProcessorJsnCfg) (e
 		self.Timezone = *jsnCfg.Timezone
 	}
 	if jsnCfg.Request_fields != nil {
-		self.RequestFields = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Request_fields)
+		if self.RequestFields, err = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Request_fields); err != nil {
+			return
+		}
 	}
 	if jsnCfg.Reply_fields != nil {
-		self.ReplyFields = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Reply_fields)
+		if self.ReplyFields, err = FCTemplatesFromFCTemapltesJsonCfg(*jsnCfg.Reply_fields); err != nil {
+			return
+		}
 	}
 	return nil
 }
diff --git a/engine/cdrefwv_test.go b/engine/cdrefwv_test.go
index 0182cfbad..464b2a07d 100644
--- a/engine/cdrefwv_test.go
+++ b/engine/cdrefwv_test.go
@@ -254,9 +254,15 @@ func TestWriteCdr(t *testing.T) {
 	var err error
 	wrBuf := &bytes.Buffer{}
 	cfg, _ := config.NewDefaultCGRConfig()
-	hdrCfgFlds = config.FCTemplatesFromFCTemapltesJsonCfg(hdrJsnCfgFlds)
-	contentCfgFlds = config.FCTemplatesFromFCTemapltesJsonCfg(contentJsnCfgFlds)
-	trailerCfgFlds = config.FCTemplatesFromFCTemapltesJsonCfg(trailerJsnCfgFlds)
+	if hdrCfgFlds, err = config.FCTemplatesFromFCTemapltesJsonCfg(hdrJsnCfgFlds); err != nil {
+		t.Error(err)
+	}
+	if contentCfgFlds, err = config.FCTemplatesFromFCTemapltesJsonCfg(contentJsnCfgFlds); err != nil {
+		t.Error(err)
+	}
+	if trailerCfgFlds, err = config.FCTemplatesFromFCTemapltesJsonCfg(trailerJsnCfgFlds); err != nil {
+		t.Error(err)
+	}
 	cdreCfg := &config.CdreConfig{
 		ExportFormat:  utils.MetaFileFWV,
 		HeaderFields:  hdrCfgFlds,