Fix typo in ConfigError message.
Fix typo in ConfigError message.

vishwaprakashmishra/xmatrix,TouK/vumi,TouK/vumi,harrissoerja/vumi,harrissoerja/vumi,TouK/vumi,vishwaprakashmishra/xmatrix,vishwaprakashmishra/xmatrix,harrissoerja/vumi