I have the same error message. I have those exact extensions installed.
I am LOATHE to install all of these extensions yet again, in fact that is the reason I even threw in the $150 smackeroos to upgrade to Data Bridge... I can't stand all of the uninstalls and conflicts.
Once again I am trying to save some coding time with WA extensions, and once again I am having trouble getting them to work.... thus investing time in WA extensions that could otherwise be used to hand code the menu I am trying to build. :(
It should be noted that I AM running the listed versions of all of these products. I deleted eCart 5.0.3 and installed 5.0.4 once it was deleted.