HTTPServer doesn't start during patch installation in FlexPLM

(OS 2)The system cannot find the file specified.  : AH00436: No installed service named "Apache2.4".

BUILD FAILED

C:\ptc\Windchill_12.1\Windchill\src\com\lcs\build\installer\RFAInstaller2.xml:2807: The following error occurred while executing this line:
C:\ptc\Windchill_12.1\Windchill\src\com\lcs\build\installer\RFAInstaller2.xml:683: java.net.ConnectException: Connection refused: connect
	at java.base/java.net.PlainSocketImpl.connect0(Native Method)
	at java.base/java.net.PlainSocketImpl.socketConnect(PlainSocketImpl.java:101)
	at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:412)
	at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:255)
	at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:237)
	at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.base/java.net.Socket.connect(Socket.java:609)
	at java.base/sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:305)
	at java.base/sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:173)
	at java.base/sun.net.NetworkClient.doConnect(NetworkClient.java:182)
	at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:507)
	at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:602)
	at java.base/sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:266)
	at java.base/sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:373)
	at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:207)
	at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1187)
	at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1081)
	at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:193)
	at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:168)
	at org.apache.tools.ant.taskdefs.Get$GetThread.openConnection(Get.java:790)
	at org.apache.tools.ant.taskdefs.Get$GetThread.get(Get.java:699)
	at org.apache.tools.ant.taskdefs.Get$GetThread.run(Get.java:689)