ElementNotVisibleException: Message: element not interactable in Robot Framework

The desired element is within a Modal Dialog Box so you need to induce WebDriverWait for the element to be visible/enabled and you can use either/both (clubbing up) of the following solutions:

• Wait Until Element Is Visible:

  Request approveSelenium2Library.Click Element   &{Landing}[reqApprove]Sleep   2sSelenium2Library.Click Element   &{Landing}[cofReq]Sleep   2sSelenium2Library.Wait Until Element Is Visible     xpath=//button[@class="btn btn-primary btn-block" and @id="btn_close_modal"]    timeout=20sSleep   3sSelenium2Library.Click Element   xpath=//button[@class="btn btn-primary btn-block" and @id="btn_close_modal"]

• Wait Until Element Is Enabled:

  Request approveSelenium2Library.Click Element   &{Landing}[reqApprove]Sleep   2sSelenium2Library.Click Element   &{Landing}[cofReq]Sleep   2sSelenium2Library.Wait Until Element Is Enabled     xpath=//button[@class="btn btn-primary btn-block" and @id="btn_close_modal"]    timeout=20sSleep   3sSelenium2Library.Click Element   xpath=//button[@class="btn btn-primary btn-block" and @id="btn_close_modal"]

• You can find a detailed discussion about Wait Until Element Is Visible and Wait Until Element Is Enabled in Robotframework: Selenium2Lib: Wait Until (…) Keywords

• Reference: Selenium2Library

try using this,

Click Element       //button[@id='btn_close_modal']

or try using java script executor,

Wait Until Page Does Not Contain   NOBODY SELECTEDExecute JavaScript  $("#btn_close_modal").click();