Hello!

I am trying to run a GSEA analysis for a dataset from GEO (GSE28735) that contains paired data for tumor and normal tissue RNA expression levels. However, while trying to upload this data (as an expression dataset) into GSEA as a .txt file, I am getting the following error:

---- Full Error Message ----
There were errors: ERROR(S) #:1
Parsing trouble
java.lang.NumberFormatException: ...

---- Stack Trace ----
# of exceptions: 1
------For input string: "GSE28735"------
java.lang.NumberFormatException: For input string: "GSE28735"
    at java.base/jdk.internal.math.FloatingDecimal.readJavaFormatString(Unknown Source)
    at java.base/jdk.internal.math.FloatingDecimal.parseFloat(Unknown Source)
    at java.base/java.lang.Float.parseFloat(Unknown Source)
    at org.gsea_msigdb.gsea/edu.mit.broad.genome.parsers.AbstractParser.parseStringToFloat(AbstractParser.java:250)
    at org.gsea_msigdb.gsea/edu.mit.broad.genome.parsers.AbstractParser.parseStringToFloat(AbstractParser.java:255)
    at org.gsea_msigdb.gsea/edu.mit.broad.genome.parsers.AbstractParser.parseFieldsIntoFloatArray(AbstractParser.java:361)
    at org.gsea_msigdb.gsea/edu.mit.broad.genome.parsers.AbstractParser.parseTextMatrixToDataset(AbstractParser.java:277)
    at org.gsea_msigdb.gsea/edu.mit.broad.genome.parsers.TxtDatasetParser.parse(TxtDatasetParser.java:108)
    at org.gsea_msigdb.gsea/edu.mit.broad.genome.parsers.ParserFactory.readDatasetTXT(ParserFactory.java:200)
    at org.gsea_msigdb.gsea/edu.mit.broad.genome.parsers.ParserFactory.read(ParserFactory.java:758)
    at org.gsea_msigdb.gsea/edu.mit.broad.genome.parsers.ParserFactory.read(ParserFactory.java:735)
    at org.gsea_msigdb.gsea/edu.mit.broad.genome.parsers.ParserWorker.doInBackground(ParserWorker.java:53)
    at java.desktop/javax.swing.SwingWorker$1.call(Unknown Source)
    at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
    at java.desktop/javax.swing.SwingWorker.run(Unknown Source)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.base/java.lang.Thread.run(Unknown Source)

I created and uploaded a .cls file for the phenotype annotation file and the gene set file into GSEA already.

From what I understood, there seems to be a problem in the file since there are non-numerical values where GSEA expects numerical values. Can anyone help in solving this?

Thank you! :)