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-rw-r--r--sparkline.go2
1 files changed, 1 insertions, 1 deletions
diff --git a/sparkline.go b/sparkline.go
index 150c0ea..5326c60 100644
--- a/sparkline.go
+++ b/sparkline.go
@@ -467,7 +467,7 @@ func (f *File) parseFormatAddSparklineSet(sheet string, opt *SparklineOption) (*
return ws, err
}
if opt == nil {
- return ws, errors.New("parameter is required")
+ return ws, ErrParameterRequired
}
if len(opt.Location) < 1 {
return ws, errors.New("parameter 'Location' is required")