R_LABEL_TEXT is a resource id and should have been generated in test.rsg as a efect of compiling the r_label_text statement from the test.rss file.
(I am kind of guesssing the resouce definition since it is missing from your problem description.) It is LABEL_TEXT that should be define in a *.loc file that has to be included in test.rss. Or you may replace that line with a language independent one Check the %EPOCROOT%epoc32\include\test.rsg file. If it is missing look for resource build errors in the build log and fix them.
RESOURCE TBUF r_label_text
buf = LABEL_TEXT;
You can also code your welcome message without the use of resources:
unless mastering the resources is what you are focusing on right now.
iLabel = new (ELeave) CEikLabel;