java.lang.IllegalArgumentException: Keys to send should be a not null CharSequence at org.openqa.selenium.remote.RemoteWebElement.sendKeys(RemoteWebElement.java:98) 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:498) at org.openqa.selenium.support.pagefactory.internal.LocatingElementHandler.invoke(LocatingElementHandler.java:52) at com.sun.proxy.$Proxy21.sendKeys(Unknown Source) at com.imm.pages.SignInPage.setUser_ID(SignInPage.java:177) at com.imm.pages.SignInPage.loginToApplication(SignInPage.java:136) at com.imm.testscripts.RemoteAttachments.RemoteAttachments.VerifyRequestRemoteAttachmentTemplateUI(RemoteAttachments.java:79) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:133) at org.testng.internal.TestInvoker.invokeMethod(TestInvoker.java:598) at org.testng.internal.TestInvoker.invokeTestMethod(TestInvoker.java:173) at org.testng.internal.MethodRunner.runInSequence(MethodRunner.java:46) at org.testng.internal.TestInvoker$MethodInvocationAgent.invoke(TestInvoker.java:824) at org.testng.internal.TestInvoker.invokeTestMethods(TestInvoker.java:146) at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:146) at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:128) at java.util.ArrayList.forEach(ArrayList.java:1257) at org.testng.TestRunner.privateRun(TestRunner.java:794) at org.testng.TestRunner.run(TestRunner.java:596) at org.testng.SuiteRunner.runTest(SuiteRunner.java:377) at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:371) at org.testng.SuiteRunner.privateRun(SuiteRunner.java:332) at org.testng.SuiteRunner.run(SuiteRunner.java:276) at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:53) at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:96) at org.testng.TestNG.runSuitesSequentially(TestNG.java:1212) at org.testng.TestNG.runSuitesLocally(TestNG.java:1134) at org.testng.TestNG.runSuites(TestNG.java:1063) at org.testng.TestNG.run(TestNG.java:1031) at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:115) at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:251) at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:77)