Fixed namespace creation crash when there is insufficient fund.

src/qt/kevadialog.cpp

@@ -457,6 +457,9 @@ int KevaDialog::createNamespace(std::string displayName, std::string& namespaceI
             case WalletModel::NamespaceTooLong:
                 msg = tr("Namespace too long \"%1\"").arg(QString::fromStdString(displayName));
                 break;
+            case WalletModel::InsufficientFund:
+                msg = tr("Insufficient funds");
+                break;
             default:
                 msg = tr("Unknown error.");
         }

src/qt/locale/bitcoin_en.ts

@@ -1181,7 +1181,12 @@
 <context>
     <name>KevaBookmarksDialog</name>
     <message>
-        <location filename="../kevabookmarksdialog.cpp" line="+23"/>
+        <location filename="../kevabookmarksdialog.cpp" line="+22"/>
+        <source>&amp;Show</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <location line="+2"/>
         <source>&amp;Edit</source>
         <translation type="unfinished"></translation>
     </message>
@@ -1215,7 +1220,7 @@
 <context>
     <name>KevaDialog</name>
     <message>
-        <location filename="../forms/kevadialog.ui" line="+267"/>
+        <location filename="../forms/kevadialog.ui" line="+271"/>
         <source>Show the selected request (does the same as double clicking an entry)</source>
         <translation type="unfinished"></translation>
     </message>
@@ -1226,8 +1231,8 @@
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location line="-234"/>
+        <location line="-238"/>
-        <location line="+44"/>
+        <location line="+48"/>
         <source>The namespace ID with a prefix &quot;N&quot;.</source>
         <translation type="unfinished"></translation>
     </message>
@@ -1327,7 +1332,7 @@
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location line="+259"/>
+        <location line="+262"/>
         <source>Warning</source>
         <translation type="unfinished">Warning</translation>
     </message>
@@ -1348,23 +1353,28 @@
     </message>
     <message>
         <location line="+3"/>
-        <location line="+122"/>
+        <location line="+125"/>
         <location line="+28"/>
         <source>Unknown error.</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location line="-148"/>
+        <location line="-151"/>
-        <location line="+122"/>
+        <location line="+125"/>
         <location line="+28"/>
         <source>Error</source>
         <translation type="unfinished">Error</translation>
     </message>
     <message>
-        <location line="-33"/>
+        <location line="-36"/>
         <source>Namespace too long &quot;%1&quot;</source>
         <translation type="unfinished"></translation>
     </message>
+    <message>
+        <location line="+3"/>
+        <source>Insufficient funds</source>
+        <translation type="unfinished">Insufficient funds</translation>
+    </message>
     <message>
         <location line="+22"/>
         <source>Cannot add key-value. Make sure you own this namespace.</source>
@@ -1461,7 +1471,7 @@
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location line="+88"/>
+        <location line="+86"/>
         <source>Requested</source>
         <translation type="unfinished"></translation>
     </message>
@@ -4196,7 +4206,7 @@
 <context>
     <name>WalletModel</name>
     <message>
-        <location filename="../walletmodel.cpp" line="+304"/>
+        <location filename="../walletmodel.cpp" line="+306"/>
         <source>Send Coins</source>
         <translation type="unfinished">Send Coins</translation>
     </message>

src/qt/locale/bitcoin_zh_CN.ts

@@ -1065,6 +1065,10 @@
         <source>Namespace too long &quot;%1&quot;</source>
         <translation><numerusform>命名空间太长: &quot;%1&quot;</numerusform></translation>
     </message>
+    <message>
+        <source>Insufficient funds</source>
+        <translation>存款不足</translation>
+    </message>
     <message>
         <source>Cannot add key-value. Make sure you own this namespace.</source>
         <translation>无法添加键值。确保您拥有此名称空间。</translation>

src/qt/walletmodel.cpp

@@ -19,6 +19,8 @@
 
 #include <base58.h>
 #include <chain.h>
+#include <univalue.h>
+#include <rpc/protocol.h>
 #include <keystore.h>
 #include <keva/common.h>
 #include <keva/main.h>
@@ -915,8 +917,17 @@ int WalletModel::createNamespace(std::string displayNameStr, std::string& namesp
     CCoinControl coinControl;
     CWalletTx wtx;
     valtype kevaNamespace;
-    SendMoneyToScript(wallet, newScript, nullptr, kevaNamespace,
+    try {
-        KEVA_LOCKED_AMOUNT, false, wtx, coinControl);
+        SendMoneyToScript(wallet, newScript, nullptr, kevaNamespace,
+            KEVA_LOCKED_AMOUNT, false, wtx, coinControl);
+    } catch (const UniValue& objError) {
+        UniValue code = objError["code"];
+        if (code.get_int() == RPC_WALLET_INSUFFICIENT_FUNDS) {
+            return WalletModel::InsufficientFund;
+        }
+        return WalletModel::CannotUpdate;
+    }
+
     keyName.KeepKey();
 
     namespaceId = EncodeBase58Check(kevaNamespace);

src/qt/walletmodel.h

@@ -131,6 +131,7 @@ public:
         KeyNotFound,
         ValueTooLong,
         CannotUpdate,
+        InsufficientFund,
     };
 
     enum EncryptionStatus