Nguyen Quang Huy 42cf6606fc Fix error string should not be capitalized (#2608)
From [Golang coding convention](https://github.com/golang/go/wiki/CodeReviewComments#error-strings)

Co-Authored-By: Nguyen Van Trung [trungnvfet@outlook.com](mailto:trungnvfet@outlook.com)
Signed-off-by: Nguyen Quang Huy [huynq0911@gmail.com](mailto:huynq0911@gmail.com)
2019-02-27 08:25:02 -05:00
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