AM installation fails if BASE_DIR is different from the path in .openamcfg

Could not write Amster keys, refer to install.log under /root/openam14 for more information. 

AMSetupServlet.processRequest: errorjava.lang.IllegalStateException: Could not write Amster keys
	at org.forgerock.openam.authentication.modules.amster.AuthorizedKeyConfiguratorPlugin.createLocalAmsterKey(AuthorizedKeyConfiguratorPlugin.java:87)
	at org.forgerock.openam.authentication.modules.amster.AuthorizedKeyConfiguratorPlugin.doPostConfiguration(AuthorizedKeyConfiguratorPlugin.java:68)
	at com.sun.identity.setup.AMSetupServlet.handlePostPlugins(AMSetupServlet.java:990)
	at com.sun.identity.setup.AMSetupServlet.configure(AMSetupServlet.java:912)
	at com.sun.identity.setup.AMSetupServlet.processRequest(AMSetupServlet.java:509)
	at com.sun.identity.config.wizard.Wizard.createConfig(Wizard.java:296)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:483)
	at org.apache.click.util.ClickUtils.invokeMethod(ClickUtils.java:3317)
	at org.apache.click.util.ClickUtils.invokeListener(ClickUtils.java:2088)
	at org.apache.click.control.AbstractControl$1.onAction(AbstractControl.java:228)
	at org.apache.click.ActionEventDispatcher.fireActionEvent(ActionEventDispatcher.java:259)
	at org.apache.click.ActionEventDispatcher.fireActionEvents(ActionEventDispatcher.java:236)
	at org.apache.click.ActionEventDispatcher.fireActionEvents(ActionEventDispatcher.java:180)
	at org.apache.click.ClickServlet.performOnProcess(ClickServlet.java:746)
	at org.apache.click.ClickServlet.processAjaxPageEvents(ClickServlet.java:1860)
	at org.apache.click.ClickServlet.processPage(ClickServlet.java:559)
	at org.apache.click.ClickServlet.handleRequest(ClickServlet.java:383)
	at org.apache.click.ClickServlet.doGet(ClickServlet.java:276)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.forgerock.openam.validation.ResponseValidationFilter.doFilter(ResponseValidationFilter.java:44)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.forgerock.openam.headers.SetHeadersFilter.doFilter(SetHeadersFilter.java:88)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at com.sun.identity.setup.AMSetupFilter.doFilter(AMSetupFilter.java:123)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.forgerock.openam.audit.context.AuditContextFilter.doFilter(AuditContextFilter.java:51)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:521)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1096)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:674)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.FileNotFoundException: /root/openam/amster_rsa (No such file or directory)
	at java.io.FileOutputStream.open(Native Method)
	at java.io.FileOutputStream.<init>(FileOutputStream.java:206)
	at java.io.FileOutputStream.<init>(FileOutputStream.java:156)
	at org.forgerock.openam.authentication.modules.amster.AuthorizedKeyConfiguratorPlugin.writePrivateKey(AuthorizedKeyConfiguratorPlugin.java:92)
	at org.forgerock.openam.authentication.modules.amster.AuthorizedKeyConfiguratorPlugin.createLocalAmsterKey(AuthorizedKeyConfiguratorPlugin.java:82)
	... 55 more