Extension name should consist only of lowercase letters and dashes

[steevrist-hah]

I have created an extension with Shoutem called d365. When I try to publish it, I get this error:
"Extension name should consist only of lowercase letters and dashes".

I have no idea where this has come form and shoutem last-error is very unenlightening.

[steevrist-hah]

extension name is not allowed. Changed it to alphaonly and all good