How to Fix Error Message

Getting the following message, "Error: unexpected numeric constant in "5.1.2". What should I do to fix this error?

Welcome. You need to provide a bit more detail before we can help. What does your code and data look like?

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Good Afternoon. This is the data and my code.

Data:

No. A2M A4GNT AAAS AACS AADAC y
TCGA.20.0987 10.353008 3.321405 4.60801 7.279213 4.605331 2.923522
TCGA.23.1031 11.635772 3.666463 5.142133 7.048869 5.775611 3.052169
TCGA.24.0979 7.954542 3.258038 5.025422 7.750161 3.846412 2.846371
TCGA.23.1117 9.9715 3.596212 5.139928 6.206031 4.468379 3.002209
TCGA.23.1021 8.971334 3.388706 5.256831 7.835422 4.415817 3.062993
TCGA.04.1337 9.042876 3.269979 4.667723 6.763047 4.159804 2.974734
TCGA.24.1852 7.952748 3.266449 5.03206 7.181784 3.780469 2.804569
TCGA.29.1692 9.068691 3.542584 4.877798 7.580572 8.45119 2.993727
TCGA.13.1817 10.19889 3.336109 4.709619 5.921329 4.546632 3.136917
TCGA.61.1916 9.699037 3.40565 5.145519 8.360284 6.119431 2.965996
TCGA.29.1704 8.336289 3.323166 4.957783 5.700931 4.06697 3.157896
TCGA.13.1819 8.661028 3.307428 5.404119 6.553031 4.17892 2.934607

Code:
library(readxl)
X5_1_2_RSquared <- read_excel("5.1.2 RSquared.xlsx")
View(X5_1_2_RSquared)