requests module generates " Can't parse uri '' "

[cartland]

First time D use :)

After dub init, I used the example from 
https://code.dlang.org/packages/requests and ran "dub add 
requests"

When I run dub, I get

requests.uri.UriException@/home/cartland/.dub/packages/requests-1.0.9/requests/source/requests/uri.d(35): Can't parse uri ''

Full output on initial run:

Fetching vibe-core 1.7.0 (getting selected version)...
Fetching requests 1.0.9 (getting selected version)...
Fetching memutils 0.4.13 (getting selected version)...
Fetching taggedalgebraic 0.11.7 (getting selected version)...
Fetching vibe-d 0.8.6 (getting selected version)...
Fetching botan-math 1.0.3 (getting selected version)...
Fetching stdx-allocator 2.77.5 (getting selected version)...
Fetching botan 1.12.10 (getting selected version)...
Fetching diet-ng 1.6.0 (getting selected version)...
Fetching openssl 1.1.6+1.0.1g (getting selected version)...
Fetching cachetools 0.3.1 (getting selected version)...
Fetching eventcore 0.8.48 (getting selected version)...
Fetching mir-linux-kernel 1.0.1 (getting selected version)...
Fetching libevent 2.0.2+2.0.16 (getting selected version)...
Fetching libasync 0.8.4 (getting selected version)...
Performing "debug" build using 
/home/cartland/dlang/dmd-2.089.0/linux/bin64/dmd for x86_64.
cachetools 0.3.1: building configuration "library"...
requests 1.0.9: building configuration "std"...
x ~master: building configuration "application"...
Linking...
Running ./x
requests.uri.UriException@/home/cartland/.dub/packages/requests-1.0.9/requests/source/requests/uri.d(35): Can't parse uri ''
Program exited with code 1