This file does not appear to be a transport package

[hitodev]

Hello

What possible reason for this message?
"1 This file does not appear to be a transport package"
at upload attempt?

I got this message with a bitnami MODX VM. Packages I tried to import are seen as valid by other MODX 2.3 installation.

The same package (e.g. getResources) uploaded through MODX repository is correctly installed but generate this error with "upload a package".

[digital-cosmos]

I got a same message. MODx version is the same where I have created a package.

[fourroses666]

I have this message on uploading an other package.
1 This file does not appear to be a transport package

[fourroses666]

unpacking the zip in /core/packages and looking locally did work.