Red Hat Certificate System, manual certificate renewal and error java.lang.NumberFormatException: For input string: x

Solution Verified - Updated -

Issue

I am trying to renew a certificate to be manually approved by agents, but at the CA end-entity page->click on link "Renewal: Renew certificate to be manually approved by agents"->After entering 0x18 the "Serial Number of Certificate to Renew" in the text field and click submit, I get the following error:

Error Message:
java.lang.NumberFormatException: For input string: "x18"

Environment

Red Hat Enterprise Linux 5
Red Hat Certificate System 8

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