Service Catalog opens a blank page, and the "+" button does not work. - Support and Troubleshooting

Service Catalog opens a blank page, and the "+" button does not work. Issue  Symptoms This issue can be reproduced when you click on the ' Service Catalog ' module from the application navigator, it opens a blank page. Additionally, when you click on the + button on top right to add content, it will not respond, and throw following error on browser console:

Uncaught ReferenceError: glideGrid is not defined at addHomeContent (js_includes_home_doctype.jsx?v=09-05-2018_1933&lp=Mon_Nov_26_07_05_31_PST_2018&c=4_53:121) at HTMLButtonElement.onclick (catalog_home.do?sysparm_view=catalog_default:403) Additionally, the logs have this error:

2018-12-11 08:41:33 (048) Default-thread-10 D7B0D7F94F1EE700CD3D97DD0210C7D8 #180881 /catalog_home.do Parameters ------------------------- sysparm_view=catalog_default 2018-12-11 08:41:33 (049) Default-thread-10 D7B0D7F94F1EE700CD3D97DD0210C7D8 *** Start #180881 /catalog_home.do, user: roma.solanki@snc 2018-12-11 08:41:33 (076) Default-thread-10 D7B0D7F94F1EE700CD3D97DD0210C7D8 [0:00:00.026] getRealForm 2018-12-11 08:41:33 (159) Default-thread-10 D7B0D7F94F1EE700CD3D97DD0210C7D8 SEVERE *** ERROR *** null:712:86: java.lang.NullPointerException java.lang.NullPointerException at com.glide.cms.RenderBlock.getBlockRenderer(RenderBlock.java:160) at com.glide.cms.RenderBlock.render0(RenderBlock.java:140) at com.glide.ui.portal.AbstractRenderer.render(AbstractRenderer.java:71) at com.glideapp.home.DropZoneRenderer.render(DropZoneRenderer.java:83) at com.glideapp.home.SerialCellRenderer.render(SerialCellRenderer.java:55) at com.glideapp.home.GenerateGridTag.getZones(GenerateGridTag.java:61) at com.glideapp.home.GenerateGridTag.doTag(GenerateGridTag.java:37) at org.apache.commons.jelly.impl.CustomTagScript.run(CustomTagScript.java:205) at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:146) at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:235) at com.glide.ui.jelly.tags.FileinfoTag2.doTag(FileinfoTag2.java:44) at org.apache.commons.jelly.impl.CustomTagScript.run(CustomTagScript.java:205) at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:146) at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:235) at com.glide.ui.jelly.tags.FileinfoTag2.doTag(FileinfoTag2.java:44) at org.apache.commons.jelly.impl.CustomTagScript.run(CustomTagScript.java:205) at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:146) at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:66) at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:146) at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:66) at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:146) at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:235) at com.glide.ui.jelly.tags.FileinfoTag2.doTag(FileinfoTag2.java:44) at org.apache.commons.jelly.impl.CustomTagScript.run(CustomTagScript.java:205) at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:235) at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:84) at org.apache.commons.jelly.impl.CustomTagScript.run(CustomTagScript.java:205) at com.glide.ui.jelly.GlideJellyContext.run(GlideJellyContext.java:665) at com.glide.ui.jelly.GlideJellyContext.executeCompiledScript(GlideJellyContext.java:893) at com.glide.ui.jelly.GlideJellyContext.runScript(GlideJellyContext.java:746) at com.glide.ui.jelly.GlideJellyContext.runScript(GlideJellyContext.java:704) at com.glide.ui.GlideFormPhase2.generate(GlideFormPhase2.java:49) at com.glide.ui.GlideForm.generatePopulatedForm(GlideForm.java:706) at com.glide.ui.GlideForm.generatePopulatedForm(GlideForm.java:691) at com.glide.ui.GlideForm.populateForm(GlideForm.java:683) at com.glide.ui.GlideForm.getRenderedPage(GlideForm.java:227) at com.glide.ui.NavigationTransaction.writeOutput(NavigationTransaction.java:157) at com.glide.ui.NavigationTransaction.process(NavigationTransaction.java:128) at com.glide.ui.GlideServletUITransaction.process(GlideServletUITransaction.java:94) at com.glide.processors.AProcessor.runProcessor(AProcessor.java:474) at com.glide.processors.AProcessor.processTransaction(AProcessor.java:199) at com.glide.processors.ProcessorRegistry.process0(ProcessorRegistry.java:178) at com.glide.processors.ProcessorRegistry.process(ProcessorRegistry.java:167) at com.glide.ui.GlideServletTransaction.process(GlideServletTransaction.java:31) at com.glide.sys.Transaction.run(Transaction.java:2037) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Release All releases

Cause The cause of this issue is a corrupted content block on this page, which can include an inactive content block iframe, etc.

Resolution Navigate to Service Catalog > Catalog Definitions > Maintain Catalogs Click on Service Catalog Go down to Related List > Catalog Portal Pages Click into the "Catalog" portal page Examine all the drop zones on this page to figure out which one is corrupted.