The same error can be seen in a Web Browser session. It occurs intermittently but doesn't cause and issues and is ignored.
If you get this error make the following change to the UI5 library bundled in your mobile client build.
Search for "var o=this._oTileDimensionCalculator.getLastCalculatedDimension()" in files library-preload.js and TileContainer.js
and insert a new variable pager, and a check on pager which returns from the function when it is undefined.
Make and new application build with the patched UI5.