dobi init is not completing

[d3netxer]

Any chance you can figure out what my issue is? I am trying to run dobi init, but it is getting stuck on step 8 out of 11:

Step 6/11 : ARG APP_UID=1000
 ---> Running in 1ea73c1312ae
Removing intermediate container 1ea73c1312ae
 ---> dbd10d757b8f
Step 7/11 : ARG APP_USER=user
 ---> Running in dbd704df23e2
Removing intermediate container dbd704df23e2
 ---> dc4a9c636a56
Step 8/11 : RUN set -x &&     useradd -u ${APP_UID} -m -s /bin/bash ${APP_USER}
 ---> Running in 87052f8e741d
+ useradd -u 0 -m -s /bin/bash user
useradd: UID 0 is not unique
[ERROR] failed to execute task "i-carto:build": The command '/bin/sh -c set -x &&     useradd -u ${APP_UID} -m -s /bin/bash ${APP_USER}' returned a non-zero code: 4