spinnaker: "There was a problem loading the clusters for this project" message in my project

Cloud Provider(s):

GCP

Feature Area:

UI

Description:

There is error message on a project screen instead of clusters with applications, see attached screen:

Steps to Reproduce:

create project, add apllications

Additional Details:

See attached error log from clouddriver: 2020-11-02 12:52:23.860 ERROR 1 --- [0.0-7002-exec-2] c.n.s.k.w.e.GenericExceptionHandlers : Internal Server Error java.lang.UnsupportedOperationException: null at com.google.common.collect.ImmutableCollection.add(ImmutableCollection.java:247) ~[guava-28.2-jre.jar:na] at com.netflix.spinnaker.clouddriver.core.ProjectClustersService$ApplicationClusterModel.lambda$new$4(ProjectClustersService.java:307) ~[clouddriver-cor at com.google.common.collect.ImmutableList.forEach(ImmutableList.java:405) ~[guava-28.2-jre.jar:na] at com.netflix.spinnaker.clouddriver.core.ProjectClustersService$ApplicationClusterModel.lambda$new$5(ProjectClustersService.java:304) ~[clouddriver-cor at com.netflix.spinnaker.clouddriver.core.ProjectClustersService$OptionalConsumer.accept(ProjectClustersService.java:461) ~[clouddriver-core.jar:na] at com.netflix.spinnaker.clouddriver.core.ProjectClustersService$ApplicationClusterModel.lambda$new$7(ProjectClustersService.java:320) ~[clouddriver-cor at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) ~[na:na] at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) ~[na:na] at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1603) ~[na:na] at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:658) ~[na:na] at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:274) ~[na:na] at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1603) ~[na:na] at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[na:na] at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[na:na] at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[na:na] at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[na:na] at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:na] at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) ~[na:na] at com.netflix.spinnaker.clouddriver.core.ProjectClustersService$ApplicationClusterModel.<init>(ProjectClustersService.java:276) ~[clouddriver-core.jar: at com.netflix.spinnaker.clouddriver.core.ProjectClustersService.lambda$getProjectClusters$0(ProjectClustersService.java:118) ~[clouddriver-core.jar:na] at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195) ~[na:na] at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1654) ~[na:na] at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[na:na] at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[na:na] at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913) ~[na:na] at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:na] at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578) ~[na:na] at com.netflix.spinnaker.clouddriver.core.ProjectClustersService.lambda$getProjectClusters$1(ProjectClustersService.java:120) ~[clouddriver-core.jar:na] at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195) ~[na:na] at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1654) ~[na:na] at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[na:na] at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[na:na] at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913) ~[na:na]