Attempt to invoke virtual method 'android.webkit.WebSettings android.webkit.WebView.getSettings()' on a null object reference
What is a NullPointerException, and how do I fix it?
I've just recently started playing D&amp;D 4e through the Red Box, and I am confused about how to fill in the power cards.  So, take Nimbus of Holy Shielding for instance. I understand the Target and Hit components as well as the effect, but my question is about the Attack component. It reads:     Attack: Wisdom vs Will.   Does the mean whatever my Wisdom score is, without the modifier, is compared to the Will score of the enemy? Would I then not even have to roll a d20 to see if it works? EU flight compensation distance for connecting flight I recently had a flight from Valencia to London, going through Düsseldorf, cancelled. According to EU regulations there are different levels of compensation for flights below and above 1500 km in distance. I assume that this distance refers to start and end airport regardless of connection. Is this the case? I haven't found a proper definition online. Here, it would make a difference as VLC to LHR is around 1350 km, but the complete itinerary is above the 1500 km threshold. Why is the amount of photos that fit on one card dependent on ISO? Change font size of the verbatim environment I want to apply small fonts inside the Verbatim environment e.g.  {\small  \begin{Verbatim}  1   double x, y; 2   double z, w; 3   main(); 4   return 0;  \end{Verbatim}}   Before the command \small and after the closing braket } text has normal size, which is obvious but the font size should be small inside the brakets.     Why is this command not applied to the environment's contents? Let $h$ the irreducible polynomial over $\Bbb F_2 = \{0, 1\}$  $$h  =  x^4 +x +1$$  Let $E=\Bbb F_2(\alpha)$, i.e. the field $\Bbb F_2$ extended with $\alpha$, where $\alpha$ is a root of $h$.   How do we determine the numbers of elements in the extension $E$? Can every non-zero element in the extension be expressed in the form $(\alpha)^n$ for some $n\in\Bbb N$ ? How do we find all the roots of $h$ over the extension $E$? Let me tell the story from the beginning: I installed Big Sur on an unsupported Mac using guidelines at Medium. In the guide it was stated that I should create a separate partition for Big Sur, and shouldn't install it on my current one. I had my SSD Called &quot;Macintosh SSD&quot; and later I created a partition named &quot;Macintosh SSD Big Sur&quot; of size 40GBs. After installation I wanted to clear the &quot;Macintosh SSD&quot; of size 80GBs(with old MacOS) and merge it with the new &quot;Macintosh SSD Big Sur&quot;. This is what I initially had after formatting partition with the old MacOS  So, I used the command sudo diskutil apfs deleteContainer disk3 after which I had (free space) in /dev/disk1  I want to extend that 39.6GB partition which free space of 80,1GB but all the commands I googled do not work:(( Could you please guide me on what I should do now? Thank you in advance! How to make a pattern follow a stroke, path or line? Here is my MS Paint job on a real bad attempt at what I'm trying to achieve:    I have access to Photoshop and Illustrator CS6, and I want to be able to draw a thick line (that is not straight) and have a pattern within the line show arrowheads within the line to indicate the direction of the line. Is the set $S=\left\{\left(z_1,z_2\right)\in \mathbb C\times \mathbb C:z_1^2+z_2^2=1\right\}.$ compact? Consider the set $$S=\left\{\left(z_1,z_2\right)\in \mathbb C\times \mathbb C:z_1^2+z_2^2=1\right\}.$$  Is this set compact in $\mathbb C^2$ ?  As $\mathbb C^2$ is a finite dimensional space so a subset of it is compact if and only if it is closed and bounded.  But $z_1^2+z_2^2=1$ gives $(x_1^2+x_2^2)-(y_1^2+y_2^2)=1$ and $x_1y_1+x_2y_2=0$ , where $z_1=x_1+iy_1$ and $z_2=x_2+iy_2$.  But from here how I can show that the set is closed and bounded ? I read on here of an exercise in interviews known as validating a binary search tree.  How exactly does this work? What would one be looking for in validating a binary search tree? I have written a basic search tree, but never heard of this concept. Difference between var = {} and var = []? What is Peter Quill's status after Guardians of the Galaxy Vol. 2? Did spacetime start with the Big Bang?  I mean, was there any presence of this spacetime we are experiencing now before big bang? And could there be a presence/existence of any other space-time before the big bang? Unable to start XAMPP using sudo in Desktop Entry Why did the Star Trek writers decide Warp 10 would be infinite? From  onward,  has a basically cubic scale from warps 1 - 9. But then, close to warp 10, it suddenly develops its own puzzling scale, as can be seen in .  In this scale, , occupying all points in the universe simultaneously and therefore effectively teleporting instantaneously.  My question is why have this confusing scale? Why not have a uniform cubic scale? Was there ever any "official" explanation for this?  Clarification: I'm looking for why the writers decided on this, not the "in-universe" explanation. If RSA is limited to 117-200 bytes or so, is that a very limited use case? Am I missing something, or is RSA very very limiting when it comes to ecrypting data when it comes to the actual message size?  I have read that you can only encrypt a message of around 117 to 200 bytes in size (depending on your key size: 1024 or 2048 bits). Is this correct?  If so, I think I have read people suggesting on using it for larger files. I guess they are just repeating the process many times over and over in blocks of 117 bytes? Norms Induced by Inner Products and the Parallelogram Law Let $ V $ be a normed vector space (over $\mathbb{R}$, say, for simplicity) with norm $ \lVert\cdot\rVert$.  It's not hard to show that if $\lVert \cdot \rVert = \sqrt{\langle \cdot, \cdot \rangle}$ for some (real) inner product $\langle \cdot, \cdot \rangle$, then the parallelogram equality $$ 2\lVert u\rVert^2 + 2\lVert v\rVert^2 = \lVert u + v\rVert^2 + \lVert u - v\rVert^2 $$ holds for all pairs $u, v \in V$.  I'm having difficulty with the converse.  Assuming the parallelogram identity, I'm able to convince myself that the inner product should be $$ \langle u, v \rangle = \frac{\lVert u\rVert^2 + \lVert v\rVert^2 - \lVert u - v\rVert^2}{2} = \frac{\lVert u + v\rVert^2 - \lVert u\rVert^2 - \lVert v\rVert^2}{2} = \frac{\lVert u + v\rVert^2 - \lVert u - v\rVert^2}{4} $$  I cannot seem to get that $\langle \lambda u,v \rangle = \lambda \langle u,v \rangle$ for $\lambda \in \mathbb{R}$.  How would one go about proving this? Making overview with linked detailed maps in QGIS? i want to create 4-5 detailed maps, and then an overview map that has rectangles that markes the locations of the detailed maps. Best case would be if the rectangles were links to the detailed map.   I have managed to make the overview and the rectangles, and think I know how to make the detailed maps one by one. The rectangles are drawn manually on the overview map. All layers that I plan on using are in the same QGIS project.  The final product that I hope to create would be the overview map on the first page, followed by the detailed maps. The overview would have links to the detailed maps, click on the rectangles to open the right detailed map.  Is there a way to link the detailed maps to the overview in QGIS 2.8 print composer?  I'm still not sure if I'm doing something wrong, when I try to create the overview. I want it to show the extents of all of my detailed maps.   Is this possible? I have a lightning component that displays Knowledge Articles based on Topic IDs that it is configured for. This works great so I went to create my test coverage for it and discovered that the inserted test Knowledge Articles can only ever be 'Draft' making my tests fail since the apex class only looks for 'Online'. Instead of rewriting my component I decided to overload the apex method so that when called without the status parameter it passes in 'Online' allowing my tests to pass in 'Draft' instead. However, the first method signature does not get called from the component resulting in null for the status parameter.  Here is the component controller:  ({     "retrieveArticles" : function(component, event, helper) {         var action = component.get("c.returnArticlesWithTwoTopicIds");         action.setParams({             mainTopicId : component.get("v.mainTopicId"),             secondaryTopicId : component.get("v.secondaryTopicId"),             limitAmount : component.get("v.limitAmount")         });          action.setCallback(this, function(response) {             var state = response.getState();             if (component.isValid() &amp;&amp; state === "SUCCESS") {                 // handle SUCCESS             }             else if (component.isValid() &amp;&amp; state === "ERROR") {                 // handle ERROR             }         });         $A.enqueueAction(action);     } })   Here is the apex class:  public with sharing class KnowledgeArticleVersionCtrl {     @AuraEnabled     public static List&lt;KnowledgeArticleVersion&gt; returnArticlesWithTwoTopicIds(String mainTopicId, String secondaryTopicId, Integer limitAmount) {         return returnArticlesWithTwoTopicIds(mainTopicId, secondaryTopicId, limitAmount, 'Online');     }      @AuraEnabled     public static List&lt;KnowledgeArticleVersion&gt; returnArticlesWithTwoTopicIds(String mainTopicId, String secondaryTopicId, Integer limitAmount, String status) {         // build query string         List&lt;KnowledgeArticleVersion&gt; articles = Database.query(query);         return articles;     } }   Is there something about the component that would cause it to not use the first signature, the one it should match, in place of the second one, which it shouldn't match? Xdotool using "DISPLAY=:0" not works in Crontab How close would you have to be to the merger of two black holes, for the effects of gravitational waves to be detected without instruments? Assume two black holes in the most common size range, spiraling into each other until they merge. The event releases significant amounts of energy via gravitational waves, which warp the space-time.  If the distortion is powerful enough, it would get noticed in daily life, or perhaps even detected by the proprioceptors in the human body.  How close, as an order of magnitude estimate, would you have to be to the merger to perceive it like that, without any instrument?